4,146 questions
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Hi, I have the same problem.
The scenario is the same as described above, Application Permission and no changes to my end/permissions.
Add tab to chat request stopped working, now it returns 400 BadRequest
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(115.19999999999999, 55.00000000000001%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EOM%3C/text%3E%3C/svg%3E)
Oleh Mihdalskyi
55
Reputation points
Hi!
I use this Graph API request to install my app to Teams chat:
POST https://graph.microsoft.com/v1.0/chats/{chatId}/installedApps
{
"@odata.bind": "https://graph.microsoft.com/v1.0/appCatalogs/teamsApps/{catalogAppId}"
}
I use Application permission type. App is published, all needed permissions listed in docs are granted. Variables chatId and catalogAppId are correct too.
Until tuesday (15th April 2025) this request worked properly: it returned 200 OK and the bot has been added to chats.
Hovewer, for the last 2 days the same request responds with 400 BadRequest and app is not being added to chats.
Nothing has been changed on my side: manifest, permissions - all is the same as before. Seems like something has been changed on the Teams API side and now this request is broken.
I tried to make this request via Graph Explorer - and there it works, but only with Delegated permission (from behalf a user). It's not useful for me because I need to make this request using my Application.
I also tried granting more permissions in Azure. It didn't help either. Event when I granted & consented all TeamsAppInstallation.* permissions - request still returns 400 BadRequest.
Please help me understand what has been changed on the Teams API side and how to make this request working again.
Microsoft Teams | Development
{count} votes
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Nivedipa-MSFT 3,646 Reputation points Microsoft External Staff Moderator2025-04-18T05:27:13.39+00:00 @Oleh Mihdalskyi - Thanks for bringing this issue to our attention. Could you please share the request ID, timestamp, and tenant ID of the failed request so that we can investigate further?
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Lalit Tiwari 0 Reputation points2025-04-18T09:36:26.96+00:00 I also have the same issue. Everything was working fine before 15 April, but after that, it has been working in a very weird way. Sometimes it gets success, and sometimes it returns with 400 errors.
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Oleh Mihdalskyi 55 Reputation points
2025-04-22T07:23:42.4266667+00:00 @Nivedipa-MSFT Hello, thanks for the quick response.
Seems like issue was somehow resolved, no more 400 errors since 18th April. I monitored this behaviour a few days more to ensure that errors won't appear again. For now everything works nice.
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