Call2Teams - Customer
Attempting to reuse a deleted user's phone number results in the Sync output error message "Can't reassign number".
Explanation of Behaviour
The portal user may encounter a sync error due to the number still being assigned to another user in MS 365.
The issue occurs because the Microsoft 365 admin has deleted the user in the Microsoft 365 admin portal before deleting them in the service portal.
This creates an issue since the PowerShell commands will no longer be able to act on the user in Microsoft 365.
Always delete the user in the service portal before deleting them from the Microsoft 365 admin portal.
If the M365 administrator has already deleted the Microsoft 365 user, then restore the user in Microsoft 365.
Perform a sync on the service portal. This will reallocate the number correctly.
Delete the user from the service portal and then Microsoft 365 as described above.