Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello.
A lot of people are reporting this issue during the last few days. Microsoft had some issue affecting 365 family last week and looks like this is due to some lingering issue.
I had some success helping other users by doing the following:
Ask the plan owner to remove you from the share, and then reshare with you. That seems to work for some users I helped. Give it a try and see if it works.