Additional sign-in or account-related issues within Microsoft Teams for business
Hi Suzanne,
Thanks - please let us know how it goes. In the meantime I hope that another expert may have some suggestions that they can chime in with.
I am using Teams successfully on an older version of macOS 10.14.6
You may set up your own meetings through the web app as well at https://teams.microsoft.com/ though I understand you would like the desktop app functioning.
Regards,
-Ashton