In Calendar, Server does not recognize user name or password/Corrupted files?

In the Calendar app on only 1 of 5 Macs, I get an error message that Calendar couldn't be refreshed because the server does not recognize the user name or password. No such issues on any other Mac or iOS/iPad OS device, all using the same user name and password.

Thinking there's files in that Mac's Library that have become corrupted and need to be trashed. Any help is appreciated,