That's not a supported scenario, guests cannot have mailboxes, be it regular or shared mailboxes. If the user needs a mailbox, convert it to regular "member" user.
Sharedmailbox to user guest.
is possible shared a sharedmailbox to user guest of my organization?, if possible how would it be done?
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Aholic Liang-MSFT 13,871 Reputation points Microsoft External Staff
2023-04-05T09:21:45.7966667+00:00 Yes. You can't give people outside your business (such as people with a Gmail account) access to your shared mailbox.
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