Requested action not taken: mailbox unavailable (S2017062302)

[Mehdi1875]

Hi,

When my colleague accepts an invitation from teams, he receives this response from outlook:

Requested action not taken: mailbox unavailable (S2017062302)

Do have an idea how can i resolve the issu ?

Thanks.

BR,

Mehdi

[#2]

Does your colleague have a full Microsoft 365 license?

[#3]

@paul keijzers, Yes, they have all full Microsoft 365 license