EM-3108
Your account has no access to this mailbox
Why it happens
Microsoft refused Rabt’s access to the mailbox: for a shared mailbox the signed-in account needs Full Access to it; the access may have been removed, or the required permissions were not accepted.
What to do
Ask your Microsoft 365 administrator to give your account Full Access to the shared mailbox (and Send As to send from it), then connect again.
- HTTP status
- 403
- Retrying does not help