Not all satellite boxes support Softcam Keys. You need a "Linux-based" or "open-source" receiver. Common brands include:
Alternatively, you can use a DVB-S2 USB tuner on a Windows PC with software like DVBViewer, ProgDVB, or DVBDream. Softcam Key
While the technology is fascinating from an engineering perspective, the practical application of Softcam keys for paid content comes with significant downsides. Not all satellite boxes support Softcam Keys
Public Softcam Keys are notorious for: