Another angle: maybe they upgraded from an older OS and the digital license is still linked through their Microsoft account. Suggesting to sign in with their account could help recover the license. But if the build is very old, maybe the migration path to a newer Windows version is better, though not feasible here since the user specifically wants activation.
Also, it's important to mention the difference between retail and OEM licenses. OEM keys are tied to hardware and aren't transferable. If it's an OEM key and the user upgraded hardware, that's why activation might fail. For retail licenses, reactivation steps might help. clave para activar windows 8 single language build 9200 240
Si tienes más detalles sobre tu situación, puedo ayudarte a encontrar una solución legal y efectiva sin compartir claves. Another angle: maybe they upgraded from an older