The sound system can't use it to say that there is no manufacturer's signature? Will you be prompted like this when installing the driver? You will usually be prompted like this. Ignore him, just pretend, and that's all. If the driver is not installed correctly, there must be no sound.

It has nothing to do with headphones. It should be the problem of driving.

Suggestion: reinstall the driver. If you are prompted without signature, just click Ignore or continue the installation. Don't worry, it's okay. It should be fine if it is installed!