diff --git a/.github/workflows/deploy_remote_tests.yml b/.github/workflows/deploy_remote_tests.yml
index c690add3..45bcf9f8 100644
--- a/.github/workflows/deploy_remote_tests.yml
+++ b/.github/workflows/deploy_remote_tests.yml
@@ -15,7 +15,7 @@ jobs:
     uses: ./.github/workflows/testing.yml
     with:
       pytest_markexpr: 'remote'
-      os_list: '["macos-13","macos-latest","ubuntu-latest"]'
+      os_list: '["windows-2022","windows-latest","macos-15-intel","macos-latest","ubuntu-latest"]'
       python_list: '["3.13"]'
     secrets:
         CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/src/nwb2bids/_command_line_interface/_main.py b/src/nwb2bids/_command_line_interface/_main.py
index 4b5f7930..b299ff36 100644
--- a/src/nwb2bids/_command_line_interface/_main.py
+++ b/src/nwb2bids/_command_line_interface/_main.py
@@ -5,6 +5,7 @@
 
 from .._converters._run_config import RunConfig
 from .._core._convert_nwb_dataset import convert_nwb_dataset
+from .._inspection._inspection_result import Severity
 from .._tools._pluralize import _pluralize
 
 
@@ -121,3 +122,9 @@ def _run_convert_nwb_dataset(
 
     if console_notification != "" and not silent:
         rich_click.echo(message=console_notification)
+
+    not_any_failures = not any(notification.severity == Severity.ERROR for notification in notifications)
+    if not_any_failures and not silent:
+        text = "BIDS dataset was successfully created!"
+        console_notification = rich_click.style(text=text, fg="green")
+        rich_click.echo(message=console_notification)
diff --git a/src/nwb2bids/bids_models/_bids_session_metadata.py b/src/nwb2bids/bids_models/_bids_session_metadata.py
index d54f46c0..37dc253f 100644
--- a/src/nwb2bids/bids_models/_bids_session_metadata.py
+++ b/src/nwb2bids/bids_models/_bids_session_metadata.py
@@ -71,14 +71,15 @@ def _check_fields(self, file_paths: list[pathlib.Path] | list[pydantic.HttpUrl])
                     title="Invalid session ID",
                     reason=(
                         "The session ID contains invalid characters. "
-                        "BIDS allows only dashes to be used as separators in session entity label. "
-                        "Underscores, spaces, slashes, and special characters (including #) are expressly forbidden."
+                        "BIDS allows only the plus sign to be used as a separator in the subject entity label. "
+                        "Underscores, dashes, spaces, slashes, and other special characters (including #) are "
+                        "expressly forbidden."
                     ),
-                    solution="Rename the session without using spaces or underscores.",
+                    solution="Rename the session without using any special characters except for `+`.",
                     examples=[
-                        "`ses_01` -> `ses-01`",
-                        "`session #2` -> `session-2`",
-                        "`id 2 from 9/1/25` -> `id-2-9-1-25`",
+                        "`ses_01` -> `ses+01`",
+                        "`session #2` -> `session+2`",
+                        "`id 2 from 9/1/25` -> `id+2+9+1+25`",
                     ],
                     field="nwbfile.session_id",
                     source_file_paths=file_paths,
diff --git a/src/nwb2bids/bids_models/_model_globals.py b/src/nwb2bids/bids_models/_model_globals.py
index 584871e2..d8fbb32b 100644
--- a/src/nwb2bids/bids_models/_model_globals.py
+++ b/src/nwb2bids/bids_models/_model_globals.py
@@ -1,4 +1,4 @@
-_VALID_ID_REGEX = r"^[A-Za-z0-9]+"
+_VALID_ID_REGEX = r"^[A-Za-z0-9+]+"
 _VALID_SPECIES_REGEX = r"([A-Z][a-z]* [a-z]+)|(http://purl.obolibrary.org/obo/NCBITaxon_\d+)"
 _VALID_BIDS_SEXES = {
     value: True
diff --git a/src/nwb2bids/bids_models/_participant.py b/src/nwb2bids/bids_models/_participant.py
index abcb71e5..e52288c9 100644
--- a/src/nwb2bids/bids_models/_participant.py
+++ b/src/nwb2bids/bids_models/_participant.py
@@ -100,14 +100,15 @@ def _check_fields(self, file_paths: list[pathlib.Path] | list[pydantic.HttpUrl])
                     title="Invalid participant ID",
                     reason=(
                         "The participant ID contains invalid characters. "
-                        "BIDS allows only dashes to be used as separators in subject entity label. "
-                        "Underscores, spaces, slashes, and special characters (including #) are expressly forbidden."
+                        "BIDS allows only the plus sign to be used as a separator in the subject entity label. "
+                        "Underscores, dashes, spaces, slashes, and other special characters (including #) are "
+                        "expressly forbidden."
                     ),
-                    solution="Rename the subject without using spaces or underscores.",
+                    solution="Rename the subject without using any special characters except for `+`.",
                     examples=[
-                        "`ab_01` -> `ab-01`",
-                        "`subject #2` -> `subject-2`",
-                        "`id 2 from 9/1/25` -> `id-2-9-1-25`",
+                        "`ab_01` -> `ab+01`",
+                        "`subject #2` -> `subject+2`",
+                        "`id 2 from 9/1/25` -> `id+2+9+1+25`",
                     ],
                     field="nwbfile.subject.subject_id",
                     source_file_paths=file_paths,
diff --git a/tests/integration/test_messages.py b/tests/integration/test_messages.py
index 4055b052..9f2d40ab 100644
--- a/tests/integration/test_messages.py
+++ b/tests/integration/test_messages.py
@@ -38,12 +38,12 @@ def test_messages_1(problematic_nwbfile_path_1: pathlib.Path, temporary_bids_dir
         nwb2bids.InspectionResult(
             title="Invalid participant ID",
             reason=(
-                "The participant ID contains invalid characters. BIDS allows only dashes to be used as separators in "
-                "subject entity label. Underscores, spaces, slashes, and special characters (including #) are "
-                "expressly forbidden."
+                "The participant ID contains invalid characters. BIDS allows only the plus sign to be used as a "
+                "separator in the subject entity label. Underscores, dashes, spaces, slashes, and other special "
+                "characters (including #) are expressly forbidden."
             ),
-            solution="Rename the subject without using spaces or underscores.",
-            examples=["`ab_01` -> `ab-01`", "`subject #2` -> `subject-2`", "`id 2 from 9/1/25` -> `id-2-9-1-25`"],
+            solution="Rename the subject without using any special characters except for `+`.",
+            examples=["`ab_01` -> `ab+01`", "`subject #2` -> `subject+2`", "`id 2 from 9/1/25` -> `id+2+9+1+25`"],
             field="nwbfile.subject.subject_id",
             source_file_paths=nwb_paths,
             data_standards=[nwb2bids.DataStandard.BIDS, nwb2bids.DataStandard.DANDI],
@@ -118,12 +118,12 @@ def test_messages_2(problematic_nwbfile_path_2: pathlib.Path, temporary_bids_dir
         nwb2bids.InspectionResult(
             title="Invalid participant ID",
             reason=(
-                "The participant ID contains invalid characters. BIDS allows only dashes to be used as separators in "
-                "subject entity label. Underscores, spaces, slashes, and special characters (including #) are "
-                "expressly forbidden."
+                "The participant ID contains invalid characters. BIDS allows only the plus sign to be used as a "
+                "separator in the subject entity label. Underscores, dashes, spaces, slashes, and other special "
+                "characters (including #) are expressly forbidden."
             ),
-            solution="Rename the subject without using spaces or underscores.",
-            examples=["`ab_01` -> `ab-01`", "`subject #2` -> `subject-2`", "`id 2 from 9/1/25` -> `id-2-9-1-25`"],
+            solution="Rename the subject without using any special characters except for `+`.",
+            examples=["`ab_01` -> `ab+01`", "`subject #2` -> `subject+2`", "`id 2 from 9/1/25` -> `id+2+9+1+25`"],
             field="nwbfile.subject.subject_id",
             source_file_paths=nwb_paths,
             target_file_paths=None,
@@ -135,14 +135,15 @@ def test_messages_2(problematic_nwbfile_path_2: pathlib.Path, temporary_bids_dir
             title="Invalid session ID",
             reason=(
                 "The session ID contains invalid characters. "
-                "BIDS allows only dashes to be used as separators in session entity label. "
-                "Underscores, spaces, slashes, and special characters (including #) are expressly forbidden."
+                "BIDS allows only the plus sign to be used as a separator in the subject entity label. "
+                "Underscores, dashes, spaces, slashes, and other special characters "
+                "(including #) are expressly forbidden."
             ),
-            solution="Rename the session without using spaces or underscores.",
+            solution="Rename the session without using any special characters except for `+`.",
             examples=[
-                "`ses_01` -> `ses-01`",
-                "`session #2` -> `session-2`",
-                "`id 2 from 9/1/25` -> `id-2-9-1-25`",
+                "`ses_01` -> `ses+01`",
+                "`session #2` -> `session+2`",
+                "`id 2 from 9/1/25` -> `id+2+9+1+25`",
             ],
             field="nwbfile.session_id",
             source_file_paths=nwb_paths,