@MSIzet thanks for the response. I think what you are saying is that your MS account username (e.g. [email protected]) is different to your Gmail account (e.g. [email protected]). If so then that's not quite the situation we are discussing here, where we want the usernames to be the same. It is however true that you can invite Gmail users to Teams meetings, I am attending a growing number, but only if the accounts are in different domains.