Hello, Xeno Void
Welcome to the Microsoft Community.
Hello, thank you for your feedback here, it seems you are experiencing a Bluetooth connection.
In order to better help you, I may need to consult you some specific information, you mentioned is currently scanning the QR code link does not work only is the phone connected to the computer or the phone connected to the TV it, if it is connected to the computer can choose not to use the QR code direct connection can also be, you can try.
In addition, you can choose to update your computer's network card driver and Bluetooth driver, you can go to the manufacturer's website to download, and then in the computer, cell phone and TV will be connected to Bluetooth records completely deleted after reconnecting.
You can specify some information after this description and I will continue to support you.
Best regards
Bobhe | Microsoft Community Support Specialist