Additional features, settings, or issues not covered by specific Microsoft Teams Free categories
Microsoft has recently disabled the option to change billing address from Skype settings.
In similar cases, users were able to fix this issue by setting language in their Microsoft account.
https://learn.microsoft.com/en-us/answers/questions/5888305/wont-let-me-update-billing-address
https://learn.microsoft.com/en-us/answers/questions/5904839/teams-blocking-skype-dial-pad