A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
What has worked recently is the terminal command provided by Microsoft. https://learn.microsoft.com/en-us/office/troubleshoot/activation/another-account-already-signed-in
Open Terminal and paste the following command:
defaults write com.microsoft.Word ResetOneAuthCreds -bool YES
It does work and has resolved similar issues on 3 different instances.