Previously used Android 8 device factory reset
I'm going to pass this via our mobile network provider (who we purchased them from) to see if they can help in this case.
Mobile operator cannot handle this.
You have to go to Samsung service centre, show them official receipt that you own the device, and they can reset the device for you. If you can't show any proof of device ownership, their global corporate policy does not allow them to reset it, as the factory reset protection mechanism is meant for device theft deterrence first required by laws in the state of California years ago.