Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Thank you to all above that have responded with suggestions. I believe that we FINALLY have resolved the matter. We were on the phone with MS Tier 2 Support for over an hour last night and after uninstalling Office for at least the 4th or 5th time, we also ran the following licensing removal tool as well. That finally seemed to do the trick (untethering the addl family account from the host account on the Mac). Here is a link for more info on removing an Office license on a Mac....
Thanks again to everyone for your help, much appreciated!