Hi @IBN
Does anyone else have the same problem in your organization?
Could you check if the app can be worked in Teams web client?
If there is no issue in Teams web client, it recommends you try to follow these steps to clear your client cache file to see if it can be fixed:
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.