MS Office 2021 does not stay activated on Mac

[User537843]

MacOS Senoma 14.1 MS Excel 2021 does not stay activated. I have restarted, reinstalled, relogged into my MS account on web, redownloaded Office 2021 Mac, it installs successfully, activates successfully, but every time I close program, and reopen, it says I am not activated.
It is the correct account, it is not a license problem, I paid for it with this account.

[#2]

Interesting. I have something very similar with my M1 MacMini and Excel. It'll be telling me it can't upload the current Excel file I'm working on to OneDrive, that I need to log in. Yet it IS in fact uploading to OneDrive. Still, though, to get rid of the message I need to log out and log in again.
Doesn't happen on the MacBook Air, and both have the current OS........ Strange!!

[#3]

@mathetes 
usually it's issue with accounts, maybe it would help to follow this one 

https://support.microsoft.com/en-us/office/what-to-try-if-you-can-t-install-or-activate-office-for-m...

[#4]

@Jan_T327 

Thanks. I've bookmarked that page. I didn't see anything that quite matched my sporadic problem, and it hasn't been bad enough to cause me to lose sleep. But if it persists--or spreads to my other Macs--then I might take advantage of the ability to report in more detail the symptoms I'm encountering.