Microsoft Office apps for Mac quit unexpectedly

Hello, thank you for reaching out to Microsoft Q&A.

1. Quit all Office applications.
2. Open Finder > Applications.
3. Use Command button +click to select all of the Microsoft 365 for Mac applications.
4. Ctrl+click the application you selected and click Move to Trash.

Once done, in the Finder, click GO in the menu bar and go to folder - ~/Library/Containers/

Delete the folders starting with,

com.microsoft.Word

com.microsoft.Excel

com.microsoft.Powerpoint

com.microsoft.Outlook

com.microsoft.OneNote

Go back to the Library folder and open Group Containers. if present, and Move to Trash.

UBF8T346G9.ms

UBF8T346G9.Office

Once done, sign in with your Microsoft account here to reinstall the Office apps.

https://account.microsoft.com/services

Let me know if you still need more help.