diff --git a/src/components/CallView/shared/ReactionToaster.vue b/src/components/CallView/shared/ReactionToaster.vue
index 8d219e193ed..65876c0a3f4 100644
--- a/src/components/CallView/shared/ReactionToaster.vue
+++ b/src/components/CallView/shared/ReactionToaster.vue
@@ -40,7 +40,7 @@ import Hex from 'crypto-js/enc-hex.js'
 import SHA1 from 'crypto-js/sha1.js'
 import TransitionWrapper from '../../UIShared/TransitionWrapper.vue'
 import { useActorStore } from '../../../stores/actor.ts'
-import { useGuestNameStore } from '../../../stores/guestName.js'
+import { useGuestNameStore } from '../../../stores/guestName.ts'
 
 const reactions = {
 	'❤️': 'Heart.gif',
diff --git a/src/components/CallView/shared/ScreenShare.vue b/src/components/CallView/shared/ScreenShare.vue
index 06c640d3e71..cc817140be1 100644
--- a/src/components/CallView/shared/ScreenShare.vue
+++ b/src/components/CallView/shared/ScreenShare.vue
@@ -32,7 +32,7 @@ import SHA1 from 'crypto-js/sha1.js'
 import panzoom from 'panzoom'
 import { computed, onBeforeUnmount, onMounted, ref } from 'vue'
 import VideoBottomBar from './VideoBottomBar.vue'
-import { useGuestNameStore } from '../../../stores/guestName.js'
+import { useGuestNameStore } from '../../../stores/guestName.ts'
 import attachMediaStream from '../../../utils/attachmediastream.js'
 
 const ZOOM_MIN = 1
diff --git a/src/components/CallView/shared/VideoVue.vue b/src/components/CallView/shared/VideoVue.vue
index c4a3b865986..0cf94a8b333 100644
--- a/src/components/CallView/shared/VideoVue.vue
+++ b/src/components/CallView/shared/VideoVue.vue
@@ -107,7 +107,7 @@ import VideoBottomBar from './VideoBottomBar.vue'
 import { ATTENDEE, AVATAR } from '../../../constants.ts'
 import { EventBus } from '../../../services/EventBus.ts'
 import { useCallViewStore } from '../../../stores/callView.ts'
-import { useGuestNameStore } from '../../../stores/guestName.js'
+import { useGuestNameStore } from '../../../stores/guestName.ts'
 import attachMediaStream from '../../../utils/attachmediastream.js'
 import { getDisplayNameWithFallback } from '../../../utils/getDisplayName.ts'
 import { ConnectionState } from '../../../utils/webrtc/models/CallParticipantModel.js'
diff --git a/src/components/GuestWelcomeWindow.vue b/src/components/GuestWelcomeWindow.vue
index 028e145e8e3..2bc5ff4557a 100644
--- a/src/components/GuestWelcomeWindow.vue
+++ b/src/components/GuestWelcomeWindow.vue
@@ -64,7 +64,7 @@ import NcModal from '@nextcloud/vue/components/NcModal'
 import NcTextField from '@nextcloud/vue/components/NcTextField'
 import Check from 'vue-material-design-icons/CheckBold.vue'
 import ConversationIcon from './ConversationIcon.vue'
-import { useGuestNameStore } from '../stores/guestName.js'
+import { useGuestNameStore } from '../stores/guestName.ts'
 
 export default {
 	name: 'GuestWelcomeWindow',
diff --git a/src/components/MediaSettings/MediaSettings.vue b/src/components/MediaSettings/MediaSettings.vue
index d0213f3c579..465a12fa999 100644
--- a/src/components/MediaSettings/MediaSettings.vue
+++ b/src/components/MediaSettings/MediaSettings.vue
@@ -264,7 +264,7 @@ import { ATTENDEE, AVATAR, CALL, CONFIG, PARTICIPANT, VIRTUAL_BACKGROUND } from
 import BrowserStorage from '../../services/BrowserStorage.js'
 import { getTalkConfig } from '../../services/CapabilitiesManager.ts'
 import { useActorStore } from '../../stores/actor.ts'
-import { useGuestNameStore } from '../../stores/guestName.js'
+import { useGuestNameStore } from '../../stores/guestName.ts'
 import { useSettingsStore } from '../../stores/settings.ts'
 import { localMediaModel } from '../../utils/webrtc/index.js'
 
diff --git a/src/components/MessagesList/MessagesGroup/Message/MessagePart/ReactionsList.vue b/src/components/MessagesList/MessagesGroup/Message/MessagePart/ReactionsList.vue
index 3496a4ea91b..083e4cca9bd 100644
--- a/src/components/MessagesList/MessagesGroup/Message/MessagePart/ReactionsList.vue
+++ b/src/components/MessagesList/MessagesGroup/Message/MessagePart/ReactionsList.vue
@@ -56,7 +56,7 @@ import NcLoadingIcon from '@nextcloud/vue/components/NcLoadingIcon'
 import IconHeartOutline from 'vue-material-design-icons/HeartOutline.vue'
 import AvatarWrapper from '../../../../AvatarWrapper/AvatarWrapper.vue'
 import { ATTENDEE, AVATAR } from '../../../../../constants.ts'
-import { useGuestNameStore } from '../../../../../stores/guestName.js'
+import { useGuestNameStore } from '../../../../../stores/guestName.ts'
 import { getDisplayNameWithFallback } from '../../../../../utils/getDisplayName.ts'
 
 export default {
diff --git a/src/components/MessagesList/MessagesGroup/Message/MessagePart/ReactionsWrapper.vue b/src/components/MessagesList/MessagesGroup/Message/MessagePart/ReactionsWrapper.vue
index 865db431fcc..e511aee7044 100644
--- a/src/components/MessagesList/MessagesGroup/Message/MessagePart/ReactionsWrapper.vue
+++ b/src/components/MessagesList/MessagesGroup/Message/MessagePart/ReactionsWrapper.vue
@@ -93,7 +93,7 @@ import IconHeartOutline from 'vue-material-design-icons/HeartOutline.vue'
 import ReactionsList from './ReactionsList.vue'
 import { ATTENDEE } from '../../../../../constants.ts'
 import { useActorStore } from '../../../../../stores/actor.ts'
-import { useGuestNameStore } from '../../../../../stores/guestName.js'
+import { useGuestNameStore } from '../../../../../stores/guestName.ts'
 import { useReactionsStore } from '../../../../../stores/reactions.js'
 import { getDisplayNameWithFallback } from '../../../../../utils/getDisplayName.ts'
 
diff --git a/src/components/MessagesList/MessagesGroup/MessagesGroup.spec.js b/src/components/MessagesList/MessagesGroup/MessagesGroup.spec.js
index a74eac89f5b..f2fbfd7fa9b 100644
--- a/src/components/MessagesList/MessagesGroup/MessagesGroup.spec.js
+++ b/src/components/MessagesList/MessagesGroup/MessagesGroup.spec.js
@@ -13,7 +13,7 @@ import MessagesGroup from './MessagesGroup.vue'
 import { ATTENDEE, MESSAGE } from '../../../constants.ts'
 import storeConfig from '../../../store/storeConfig.js'
 import { useActorStore } from '../../../stores/actor.ts'
-import { useGuestNameStore } from '../../../stores/guestName.js'
+import { useGuestNameStore } from '../../../stores/guestName.ts'
 
 describe('MessagesGroup.vue', () => {
 	const TOKEN = 'XXTOKENXX'
diff --git a/src/components/MessagesList/MessagesGroup/MessagesGroup.vue b/src/components/MessagesList/MessagesGroup/MessagesGroup.vue
index 0c8a75d7a55..cd522bd74fc 100644
--- a/src/components/MessagesList/MessagesGroup/MessagesGroup.vue
+++ b/src/components/MessagesList/MessagesGroup/MessagesGroup.vue
@@ -38,7 +38,7 @@ import MessageItem from './Message/MessageItem.vue'
 import { useMessageInfo } from '../../../composables/useMessageInfo.ts'
 import { ATTENDEE, AVATAR } from '../../../constants.ts'
 import { useActorStore } from '../../../stores/actor.ts'
-import { useGuestNameStore } from '../../../stores/guestName.js'
+import { useGuestNameStore } from '../../../stores/guestName.ts'
 
 export default {
 	name: 'MessagesGroup',
diff --git a/src/components/NewMessage/NewMessageTypingIndicator.vue b/src/components/NewMessage/NewMessageTypingIndicator.vue
index 563abac8427..0c987f42e88 100644
--- a/src/components/NewMessage/NewMessageTypingIndicator.vue
+++ b/src/components/NewMessage/NewMessageTypingIndicator.vue
@@ -32,7 +32,7 @@ import escapeHtml from 'escape-html'
 import AvatarWrapper from '../AvatarWrapper/AvatarWrapper.vue'
 import { AVATAR } from '../../constants.ts'
 import { useActorStore } from '../../stores/actor.ts'
-import { useGuestNameStore } from '../../stores/guestName.js'
+import { useGuestNameStore } from '../../stores/guestName.ts'
 
 export default {
 	name: 'NewMessageTypingIndicator',
diff --git a/src/components/SetGuestUsername.vue b/src/components/SetGuestUsername.vue
index 775211ab3f7..f3013843e6c 100644
--- a/src/components/SetGuestUsername.vue
+++ b/src/components/SetGuestUsername.vue
@@ -61,7 +61,7 @@ import IconPencilOutline from 'vue-material-design-icons/PencilOutline.vue'
 import { useGetToken } from '../composables/useGetToken.ts'
 import { EventBus } from '../services/EventBus.ts'
 import { useActorStore } from '../stores/actor.ts'
-import { useGuestNameStore } from '../stores/guestName.js'
+import { useGuestNameStore } from '../stores/guestName.ts'
 
 const { compact = false } = defineProps<{
 	compact?: boolean
diff --git a/src/composables/__tests__/useMessageInfo.spec.js b/src/composables/__tests__/useMessageInfo.spec.js
index d203d101a1f..9d1c6d89a2d 100644
--- a/src/composables/__tests__/useMessageInfo.spec.js
+++ b/src/composables/__tests__/useMessageInfo.spec.js
@@ -9,7 +9,7 @@ import { computed, ref } from 'vue'
 import { useStore } from 'vuex'
 import { ATTENDEE, CONVERSATION, MESSAGE } from '../../constants.ts'
 import { useActorStore } from '../../stores/actor.ts'
-import { useGuestNameStore } from '../../stores/guestName.js'
+import { useGuestNameStore } from '../../stores/guestName.ts'
 import { useConversationInfo } from '../useConversationInfo.ts'
 import { useMessageInfo } from '../useMessageInfo.ts'
 
diff --git a/src/composables/useMessageInfo.ts b/src/composables/useMessageInfo.ts
index 6a9f6987f86..f318f3db9e6 100644
--- a/src/composables/useMessageInfo.ts
+++ b/src/composables/useMessageInfo.ts
@@ -12,7 +12,7 @@ import { useStore } from 'vuex'
 import { ATTENDEE, CONVERSATION, MESSAGE } from '../constants.ts'
 import { hasTalkFeature } from '../services/CapabilitiesManager.ts'
 import { useActorStore } from '../stores/actor.ts'
-import { useGuestNameStore } from '../stores/guestName.js'
+import { useGuestNameStore } from '../stores/guestName.ts'
 import { ONE_DAY_IN_MS, ONE_HOUR_IN_MS } from '../utils/formattedTime.ts'
 import { getDisplayNameWithFallback } from '../utils/getDisplayName.ts'
 import { useConversationInfo } from './useConversationInfo.ts'
diff --git a/src/store/messagesStore.js b/src/store/messagesStore.js
index d4fbd587b09..f2c2a9c264a 100644
--- a/src/store/messagesStore.js
+++ b/src/store/messagesStore.js
@@ -29,7 +29,7 @@ import { useActorStore } from '../stores/actor.ts'
 import { useCallViewStore } from '../stores/callView.ts'
 import { useChatStore } from '../stores/chat.ts'
 import { useChatExtrasStore } from '../stores/chatExtras.ts'
-import { useGuestNameStore } from '../stores/guestName.js'
+import { useGuestNameStore } from '../stores/guestName.ts'
 import { usePollsStore } from '../stores/polls.ts'
 import { useReactionsStore } from '../stores/reactions.js'
 import { useSharedItemsStore } from '../stores/sharedItems.ts'
diff --git a/src/store/messagesStore.spec.js b/src/store/messagesStore.spec.js
index c7833c716ba..07c4df511fa 100644
--- a/src/store/messagesStore.spec.js
+++ b/src/store/messagesStore.spec.js
@@ -30,7 +30,7 @@ import {
 } from '../services/messagesService.ts'
 import { useActorStore } from '../stores/actor.ts'
 import { useChatStore } from '../stores/chat.ts'
-import { useGuestNameStore } from '../stores/guestName.js'
+import { useGuestNameStore } from '../stores/guestName.ts'
 import { useReactionsStore } from '../stores/reactions.js'
 import { generateOCSErrorResponse, generateOCSResponse } from '../test-helpers.js'
 import CancelableRequest from '../utils/cancelableRequest.js'
diff --git a/src/store/participantsStore.js b/src/store/participantsStore.js
index 403861f5da9..36a47d70906 100644
--- a/src/store/participantsStore.js
+++ b/src/store/participantsStore.js
@@ -34,7 +34,7 @@ import SessionStorage from '../services/SessionStorage.js'
 import { talkBroadcastChannel } from '../services/talkBroadcastChannel.js'
 import { useActorStore } from '../stores/actor.ts'
 import { useCallViewStore } from '../stores/callView.ts'
-import { useGuestNameStore } from '../stores/guestName.js'
+import { useGuestNameStore } from '../stores/guestName.ts'
 import pinia from '../stores/pinia.ts'
 import { useSessionStore } from '../stores/session.ts'
 import { useTokenStore } from '../stores/token.ts'
diff --git a/src/store/participantsStore.spec.js b/src/store/participantsStore.spec.js
index c11e61870fe..702ff5e54c8 100644
--- a/src/store/participantsStore.spec.js
+++ b/src/store/participantsStore.spec.js
@@ -31,7 +31,7 @@ import {
 } from '../services/participantsService.js'
 import SessionStorage from '../services/SessionStorage.js'
 import { useActorStore } from '../stores/actor.ts'
-import { useGuestNameStore } from '../stores/guestName.js'
+import { useGuestNameStore } from '../stores/guestName.ts'
 import { useSessionStore } from '../stores/session.ts'
 import { useTokenStore } from '../stores/token.ts'
 import { generateOCSErrorResponse, generateOCSResponse } from '../test-helpers.js'
diff --git a/src/stores/__tests__/guestName.spec.js b/src/stores/__tests__/guestName.spec.js
index d0a8e82a922..380bba03739 100644
--- a/src/stores/__tests__/guestName.spec.js
+++ b/src/stores/__tests__/guestName.spec.js
@@ -10,7 +10,7 @@ import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest'
 import { setGuestUserName } from '../../services/participantsService.js'
 import { generateOCSErrorResponse } from '../../test-helpers.js'
 import { useActorStore } from '../actor.ts'
-import { useGuestNameStore } from '../guestName.js'
+import { useGuestNameStore } from '../guestName.ts'
 
 vi.mock('../../services/participantsService', () => ({
 	setGuestUserName: vi.fn(),
diff --git a/src/stores/__tests__/session.spec.js b/src/stores/__tests__/session.spec.js
index 996e8cff9e2..cea667babf1 100644
--- a/src/stores/__tests__/session.spec.js
+++ b/src/stores/__tests__/session.spec.js
@@ -7,7 +7,7 @@ import { createPinia, setActivePinia } from 'pinia'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { ATTENDEE, PARTICIPANT } from '../../constants.ts'
 import vuexStore from '../../store/index.js'
-import { useGuestNameStore } from '../guestName.js'
+import { useGuestNameStore } from '../guestName.ts'
 import { useSessionStore } from '../session.ts'
 
 describe('sessionStore', () => {
diff --git a/src/stores/guestName.js b/src/stores/guestName.js
deleted file mode 100644
index c82101a2fcf..00000000000
--- a/src/stores/guestName.js
+++ /dev/null
@@ -1,109 +0,0 @@
-/**
- * SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
- * SPDX-License-Identifier: AGPL-3.0-or-later
- */
-
-import { getGuestNickname, setGuestNickname } from '@nextcloud/auth'
-import { t } from '@nextcloud/l10n'
-import { defineStore } from 'pinia'
-import { setGuestUserName } from '../services/participantsService.js'
-import { useActorStore } from './actor.ts'
-
-export const useGuestNameStore = defineStore('guestName', {
-	state: () => ({
-		guestNames: {},
-		guestUserName: getGuestNickname() || '',
-	}),
-
-	actions: {
-		/**
-		 * Gets the participant display name
-		 *
-		 * @param {string} token the conversation's token
-		 * @param {string} actorId the participant actorId
-		 * @return {string} the participant name
-		 */
-		getGuestName(token, actorId) {
-			return this.guestNames[token]?.[actorId] ?? t('spreed', 'Guest')
-		},
-
-		/**
-		 * Gets the participant display name with suffix
-		 * if the display name is not default translatable Guest
-		 *
-		 * @param {string} token the conversation's token
-		 * @param {string} actorId the participant actorId
-		 * @return {string} the participant name with/without suffix
-		 */
-		getGuestNameWithGuestSuffix(token, actorId) {
-			const displayName = this.getGuestName(token, actorId)
-			if (displayName === t('spreed', 'Guest')) {
-				return displayName
-			}
-			return t('spreed', '{guest} (guest)', {
-				guest: displayName,
-			})
-		},
-
-		/**
-		 * Adds a guest name to the store
-		 *
-		 * @param {object} data the wrapping object
-		 * @param {string} data.token the token of the conversation
-		 * @param {string} data.actorId the guest
-		 * @param {string} data.actorDisplayName the display name to set
-		 * @param {object} options options
-		 * @param {boolean} options.noUpdate Override the display name or set it if it is empty
-		 */
-		addGuestName({ token, actorId, actorDisplayName }, { noUpdate }) {
-			if (!this.guestNames[token]) {
-				this.guestNames[token] = {}
-			}
-			if (!this.guestNames[token][actorId] || actorDisplayName === '') {
-				this.guestNames[token][actorId] = t('spreed', 'Guest')
-			} else if (noUpdate) {
-				return
-			}
-
-			if (actorDisplayName) {
-				this.guestNames[token][actorId] = actorDisplayName
-			}
-		},
-
-		/**
-		 * Add the submitted guest name to the store
-		 *
-		 * @param {string} token the token of the conversation
-		 * @param {string} name the new guest name
-		 */
-		async submitGuestUsername(token, name) {
-			if (!name) {
-				return
-			}
-			const actorStore = useActorStore()
-			const actorId = actorStore.actorId
-			const previousName = this.getGuestName(token, actorId)
-
-			try {
-				actorStore.setDisplayName(name)
-				this.addGuestName({
-					token,
-					actorId,
-					actorDisplayName: name,
-				}, { noUpdate: false })
-
-				await setGuestUserName(token, name)
-
-				setGuestNickname(name)
-			} catch (error) {
-				actorStore.setDisplayName(previousName)
-				this.addGuestName({
-					token,
-					actorId,
-					actorDisplayName: previousName,
-				}, { noUpdate: false })
-				console.error(error)
-			}
-		},
-	},
-})
diff --git a/src/stores/guestName.ts b/src/stores/guestName.ts
new file mode 100644
index 00000000000..97ce15fcc1f
--- /dev/null
+++ b/src/stores/guestName.ts
@@ -0,0 +1,118 @@
+/**
+ * SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { getGuestNickname, setGuestNickname } from '@nextcloud/auth'
+import { t } from '@nextcloud/l10n'
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { setGuestUserName } from '../services/participantsService.js'
+import { useActorStore } from './actor.ts'
+
+type AddGuestNamePayload = { token: string, actorId: string, actorDisplayName: string }
+
+export const useGuestNameStore = defineStore('guestName', () => {
+	const LOCALIZED_GUEST = t('spreed', 'Guest')
+
+	/** A map of guest names per conversation token and actorId */
+	const guestNames = ref<Record<string, Record<string, string>>>({})
+
+	/** An own display name of a current guest-user */
+	const guestUserName = ref(getGuestNickname() || '')
+
+	/**
+	 * Gets the participant display name
+	 *
+	 * @param token the conversation's token
+	 * @param actorId the participant actorId
+	 */
+	function getGuestName(token: string, actorId: string): string {
+		return guestNames.value[token]?.[actorId] ?? LOCALIZED_GUEST
+	}
+
+	/**
+	 * Gets the participant display name with suffix
+	 * if the display name is not default, gets localized 'Guest'
+	 *
+	 * @param token the conversation's token
+	 * @param actorId the participant actorId
+	 */
+	function getGuestNameWithGuestSuffix(token: string, actorId: string): string {
+		const guest = getGuestName(token, actorId)
+		if (guest === LOCALIZED_GUEST) {
+			return guest
+		}
+		return t('spreed', '{guest} (guest)', { guest })
+	}
+
+	/**
+	 * Adds a guest name to the store
+	 *
+	 * @param payload the wrapping object
+	 * @param payload.token the token of the conversation
+	 * @param payload.actorId the guest id
+	 * @param payload.actorDisplayName the display name to set
+	 * @param options options
+	 * @param options.noUpdate Override the display name or set it, if it is empty
+	 */
+	function addGuestName({ token, actorId, actorDisplayName }: AddGuestNamePayload, { noUpdate }: { noUpdate: boolean }) {
+		if (!guestNames.value[token]) {
+			guestNames.value[token] = {}
+		}
+		if (!guestNames.value[token][actorId] || actorDisplayName === '') {
+			guestNames.value[token][actorId] = LOCALIZED_GUEST
+		} else if (noUpdate) {
+			return
+		}
+
+		if (actorDisplayName) {
+			guestNames.value[token][actorId] = actorDisplayName
+		}
+	}
+
+	/**
+	 * Add the submitted guest name to the store
+	 *
+	 * @param token the token of the conversation
+	 * @param name the new guest name
+	 */
+	async function submitGuestUsername(token: string, name: string) {
+		if (!name) {
+			return
+		}
+		const actorStore = useActorStore()
+		const actorId = actorStore.actorId!
+		const previousName = getGuestName(token, actorId)
+
+		try {
+			actorStore.setDisplayName(name)
+			addGuestName({
+				token,
+				actorId,
+				actorDisplayName: name,
+			}, { noUpdate: false })
+
+			await setGuestUserName(token, name)
+
+			setGuestNickname(name)
+		} catch (error) {
+			actorStore.setDisplayName(previousName)
+			addGuestName({
+				token,
+				actorId,
+				actorDisplayName: previousName,
+			}, { noUpdate: false })
+			console.error(error)
+		}
+	}
+
+	return {
+		guestUserName,
+
+		getGuestName,
+		getGuestNameWithGuestSuffix,
+		addGuestName,
+		submitGuestUsername,
+	}
+})
diff --git a/src/stores/session.ts b/src/stores/session.ts
index 4e4247f4007..201819759d4 100644
--- a/src/stores/session.ts
+++ b/src/stores/session.ts
@@ -17,7 +17,7 @@ import SHA1 from 'crypto-js/sha1.js'
 import { defineStore } from 'pinia'
 import { ATTENDEE, PARTICIPANT } from '../constants.ts'
 import store from '../store/index.js'
-import { useGuestNameStore } from './guestName.js'
+import { useGuestNameStore } from './guestName.ts'
 
 type Session = {
 	attendeeId: number | undefined