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Deleted Resource account with phone number still assigned.
At the bottom Manage resource accounts in teams, there is a section for deleting resource accounts. https://docs.microsoft.com/en-us/microsoftteams/manage-resource-accounts It states: Make sure...
If you delete a resource account without first removing the phone number you can run Get-CsPhoneNumberAssignment -TelephoneNumber <+phonenumber> and note the AssignedPstnTargetId which is the Identity of the deleted Resource Account.
Then run the following to remove the number.
Remove-CsPhoneNumberAssignment -Identity <AssignedPstnTargetId> -PhoneNumber <+phonenumber to unassign> -PhoneNumberType <DirectRouting|CallingPlan|OperatorConnect>
