I recently had to move a mailbox alias from an existing mailbox to a hared mailbox. Every time I attempted to do so I received the following error:
The name is already being used. Please try another name
The error isn’t real helpful because it doesn’t tell you exactly what the other object causing the conflict could be. To make life easier and look across the array of places the conflict could be I created the following script:
https://github.com/directorcia/Office365/blob/master/find-name-conflict.ps1
with documentation at:
In my case the issue was with a ‘Name’ value in Entra ID but the script will also give your recommendations on what PowerShell commands to run to overcome any issues it detects. I ran these and I was good to!
Hopefully, this script makes it easier to find any conflicts.
CIAOPS 