Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Padawan_Lance,
This happened because user signed in with the Microsoft 365 account, if other user doesn’t have Microsoft 365 account, they can simply sign out of Office apps and then sign back in with their Office 2019 account and then re-open the app (close and re-open is an important step). This should revert the Office apps to the original state i.e., Office 2019.
Besides, if you wanted to know about the Group policy, please post in the Microsoft Q & A community under windows-group-policy tag.
Kind regards,
Neha