Issue creating shared mailbox
i am unable to create a shared mailbox on cloud panel, error code is "Issue creating shared mailbox".
PFA for reference.
That error you posted is an error coming directly from Exchange. I've seen this issue before and if you try to create a mailbox via ECP it most likely will give you the same error.
NO Luck with this article
I believe there is a some kind of permission issue,
What happens when you create a shared mailbox with ECP? All CloudPanel is doing is running the New-Mailbox -Shared powershell command and Exchange is giving that error back.