Hi @IMK
Is it possible to invite external non-licensed users to Teams chat without them having an email address?
You could invite external non-licensed users to Teams chat without have an email address. As above said, in Teams meeting, user could join meeting chat as anonymous. For more details about how to join Teams meeting anonymously, you could learn it from:
https://support.microsoft.com/en-us/office/join-a-meeting-without-a-teams-account-c6efc38f-4e03-4e79-b28f-e65a4c039508
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