Hi @SAMEER ACHHAB ,
Does anyone else have the same issue in your organization?
Can you see assignment normally in Teams web client?
In this case, we recommend you try to clean your Teams client cache file and restart it to see if this issue can be fixed. For more details about it, you can refer to:
https://www.onmsft.com/how-to/how-to-clear-your-microsoft-teams-cache-on-windows-10
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