Is there a driver or software disk? USB Microphones are mono. If the system thinks it’s connected to a microphone, then it may default to one channel. When I connect things, they either say the name of the device or “USB Audio Device.” They show up, and work stereo.
We also warn people that USB Turntables are throw-away devices like a paper towel and they don’t have a lot of design and quality control.
Koz