Shared mailbox error: The email address is already being used

Question

HI!

I like to find out why im not able to create some shared mailbox. I have sevral "domains" in the same Tenat, and when I want to create a shared-mailbox for one of the domains I get this:
Error:
The email address is already being used. Please choose another email address.

When i search in the GUI for the mailbox I cannot find it!
When I did a export; Get-mailbox and Get-Recipient to Excel the mail address I want to create isent in that list.

Where do i start troubleshooting??

Answer 1

The fastest/easiest way to find whether the address is in use is via the Get-Recipient cmdlet:

Get-Recipient user@domain.com

Other than that, the UI has the "helpful" feature of checking for duplicate alias (mailNickname) values, so you might want to try creating the shared mailbox via PowerShell instead:

New-Mailbox -Name shared -PrimarySmtpAddress shared@domain.com -Shared