Additional features, settings, or issues not covered by specific Microsoft Teams categories
Please check the following thread:https://techcommunity.microsoft.com/t5/Microsoft-Teams/Get-Email-address-for-a-new-created-team/m-p/202770#M14516
Why this happens:
The get email feature needs the connected Team site. The connected Team site isn't always provisioned, while this should happen automatically.
Workaround:
Simply navigate to the connected Team site or upload files to provision it. The get email address feature will start working.
What to do next?
****Microsoft can reproduce it. I was able to reproduce it today by creating a trial tenant, first try. You might have to create many Microsoft Teams environments to reproduce it in your tenant. I'm not sending more logs as they have all the info they need to investigate this and work on a fix.