input failure for the module itself

I bought a TV POLARLINE 50PU11TC-SM, 50″, Ultra HD 4K. At home, when I connected home TV from MTS via the CAM module, the TV found all the channels, but for some reason they are all blocked and do not show. I called a technician from MTS, he checked the CAM module. From his side everything works.Could you explain to me what is the malfunction of the TV.Source: https://cxcvb.com/zadat-vopros