An error occurred while saving the commentTimo commented
I have the same problem (with accounts in multiple tenants) creating meetings I can't join myself. I finally figured out why...
It has to do with the logged in user in my last active browser (I use Brave). I use multiple profiles in Brave or my different tenants. The last active profile determines the owner of teams meeting created in Outlook.
So If you have this problem. Try this:
Login in your browser on office.com as user in the correct tenant.
Open Outlook and create a teams meeting
Check that you are the owner of this meeting.