Additional calendar-related features and issues within Microsoft Teams for Education
This issue very specific to their recent update and also specific to devices too.
My Kid also using Amazon Fire Tablet. Multiple uninstall and install didn't work. One work around I have done is downgrade the Teams version by installing APK separately ( not via Google play store). Installed 1416.20200728 version.
It worked fine for me. Able to join the calls.
This could help some one facing the similar issue. Its work around not solution.
Thanks
Indhu.
Thanks Indhu for posting this workaround. This worked for me .