2.3 Check RDP listening ports and bindings
Mismatched encryption between the client and server is a common trigger for code 0x7. rdp error code 0x3 extended error code 0x7
Identifying your scenario can cut troubleshooting time in half. rdp error code 0x3 extended error code 0x7
Group policies preventing device installation or mismatched encryption settings between client and host. rdp error code 0x3 extended error code 0x7