Warzone on PC is widely associated with hardware ID bans through Ricochet. The ban follows the machine, so a second Activision login on that PC can be refused the same way.
Ricochet’s checks are not public and they move with each season. What players can see is the result: the computer is the thing being turned away.
The Warzone spoofer is built for that hardware ID case. It presents different device identifiers than the ones stored with the ban.