A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
I fixed it with the help of Microsoft support:
"Just a quick recap, you contacted Microsoft support because you needed help with removing the sharepoint keychain prompt on your Mac. After investigation, we have found that the problem is due to your OneDrive standalone for business app. We resolved it by removing the auto-update file in keychain, office keychain and onedrive keychain."
We also removed OneDrive, restarted and reinstalled OneDrive