New interfaces have a limited number of "test" uses before they must be registered online. Go to Options > Config > Registration .
If you are using a and receive this error:
Check the vehicle's cigarette lighter or OBD-II power fuse, as a blown fuse can starve the interface of necessary operating voltage. The Reality of VCDS Clone Cables
Plug the cable back in and try a "Test" in the VCDS options menu. 2. Force a Firmware Update (HEX-V2/HEX-NET)
If none of the above steps work, contact Ross-Tech directly. Be prepared to provide a screenshot of the "About" screen within VCDS which contains your interface's serial number and license details. Their support team can diagnose the issue and provide the correct path forward.
If you own an authentic cable, this error is usually a technical glitch rather than a permanent ban.