Teams : We were unable to plan the event. We couldn't find the mailbox.

Frédéric MASSOT 1 Reputation point


I'm trying to schedule a meeting in Teams and I get the following error message (in French): We were unable to schedule the event. We couldn't find the mailbox.

I don't know which mailbox this error message is referring to. It could be more specific.


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A Microsoft customizable chat-based workspace.
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  1. Sharon Zhao-MSFT 24,656 Reputation points Microsoft Employee

    @Frédéric MASSOT ,

    Please check if you have been assigned Exchange Online license in Microsoft 365 admin center.

    I tested in my lab. It will show the same error message after I unassigned the Exchange Online license when scheduling meetings in Teams client.

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