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Hi @Floor Meijer
According to your case description, you encountered an error that the mailbox is unavailable when inviting others to join the meeting. Please try the following possible solutions:
- Check the status of the recipient's mailbox: Make sure the recipient's mailbox is valid and there is no setting to block or filter Teams meeting invitations.
- Resend the invitation: Resending the meeting invitation can solve unexpected problems. You can try to delete the original invitation and then resend it.
- Use the web version of Teams: Try to use the web version of Teams to create and send meeting invitations to see if the problem can be solved. https://teams.microsoft.com/v2/
- Teams add-in problem: If you invite through Outlook, please check whether the Teams meeting add-in is enabled.
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