Teams Crashes on Activity Notification in Group Chat

[Ashlesha-MSFT]

Hi there,

Our app sends activity notifications, and we’ve encountered an issue specifically with Group Chats.

Description
For Group Chats, we send activity notifications from our C# backend using the following parameters:

// ChannelChatId for Group Chats has the format: 19:xxxx....xxxxxxxx@thread.v2

var topic = new Dictionary<string, object?>
{
{"source", "entityUrl"},
{"value", $"https://graph.microsoft.com/v1.0/chats/{notificationRequest.Instance.ChannelChatId}"}
};

// ...

url = $"https://graph.microsoft.com/v1.0/chats/{notificationRequest.Instance.ChannelChatId}/sendActivityNotification";

Aside from differences in URLs and Topic Values between Teams channels and Group Chats, the implementation is identical. This code works correctly for Teams channels, but not for Group Chats.

Environment
Windows 11, Teams Desktop Client
Windows 11, Browser (Google Chrome)
Observed behavior
When sending an activity notification to a Group Chat:

The notification popup appears correctly in Microsoft Teams.
Clicking the popup opens the Group Chat in a new window (expected).
When switching to the Activity area in Microsoft Teams, Teams crashes — it immediately jumps back to the area that was open before (notification is visible for a brief moment).
Expected behavior
Teams should display the activity notification and allow navigation to the Activity area without crashing.

Request
Could you please investigate whether there is a broader issue with activity notifications sent by apps to Group Chats? Any guidance, known issues, or required changes on our side would be appreciated.

Thanks!

[atktroubleshootingapp]

👋 Hi @Ashlesha-MSFT,

Thank you for reporting this issue. Here is an AI-generated initial response:

Classification: Upstream — The reported Activity-pane failure is consistent with a Teams or Microsoft Graph issue, but its cause and owning component are unverified.

• The reporter observes the notification popup and chat opening, then a return to the previous area when opening Activity on Windows 11 in both Teams desktop and Chrome.
• The Graph chat notification API explicitly supports a chat entityUrl topic matching the request’s chat ID. The URL pattern shown is therefore not, by itself, evidence of incorrect usage.

What to do now:

1. Confirm the app is installed in that chat, and compare the complete redacted request with Graph’s group-chat example.
2. Test a minimal notification with a text topic and valid Teams webUrl to isolate topic handling; this is a diagnostic, not a confirmed workaround.
3. If it persists, provide Teams client versions, a reproduction, Graph response/request ID, timestamp, and client logs to Microsoft support.

Useful links:

• No sufficiently relevant related issue found in the searched repos.
• Teams activity-feed requirements

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Note: AI-generated guidance may be incomplete or incorrect. Please verify suggestions before applying them.