Windows – Unable to join domain. “An account with the same name exists in Active Directory. Re-using the account was blocked by security policy”

Scenario: The error below was received when joining a new computer to a domain (the computer object was pre-staged in AD by creating the computer object and resetting it).

Error: “An account with the same name exists in Active Directory. Re-using the account was blocked by security policy”

Solution: Add the following Reg Key:

Reg add HKLM\System\CurrentControlSet\Control\Lsa /v NetJoinLegacyAccountReuse /t REG_DWORD /d 1 /f