We are responsible for general issues about Office desktop applications.
Since your issue is out of our scope of support, I would modify the tag to be “not-supported”.
I would suggest you to post your issue on the Microsoft answers forum.
Thanks for your understanding.
If needed, you could refer to “Is there an Office 365 Post migration checklist or test plan for end users?”.
Moreover, “The Ultimate User-Friendly Office 365 Post-Migration Checklist” may also be helpful for you.
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
If you have any updates, you could also share them in this thread.
Regards,
Erin
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