diff --git a/dotnet/packages/Microsoft.TeamsAI/Microsoft.TeamsAI/Application/Authentication/Bot/TeamsSsoPrompt.cs b/dotnet/packages/Microsoft.TeamsAI/Microsoft.TeamsAI/Application/Authentication/Bot/TeamsSsoPrompt.cs
index 3b10f3f8c..3e3ab988b 100644
--- a/dotnet/packages/Microsoft.TeamsAI/Microsoft.TeamsAI/Application/Authentication/Bot/TeamsSsoPrompt.cs
+++ b/dotnet/packages/Microsoft.TeamsAI/Microsoft.TeamsAI/Application/Authentication/Bot/TeamsSsoPrompt.cs
@@ -29,7 +29,7 @@ public override async Task<DialogTurnResult> BeginDialogAsync(DialogContext dc,
             int timeout = _settings.Timeout;
 
             IDictionary<string, object> state = dc.ActiveDialog.State;
-            state[_expiresKey] = DateTime.Now.AddMilliseconds(timeout);
+            state[_expiresKey] = DateTime.UtcNow.AddMilliseconds(timeout);
 
             // Send OAuth card to get SSO token
             await this.SendOAuthCardToObtainTokenAsync(dc.Context, cancellationToken);