I have factory new AirPods Pro (1st Generation) and use them with an iPhone, which works perfectly fine. Audio quality is good as expected. On Windows 10, this is different. Audio output is good as expected, but the microphone level is so low (<20%, no matter how loud I talk), that the quality is just bad. Apps tend to adapt the level so heavily that I sound like I'm sitting in a tin can.
There's only one bluetooth device for input for output two (headset and hands-free). I'm only using the headset one, as hands-free is mono audio and bad.
I appreciate any hint how to change the microphone level natively, so that I can use them on Windows, too.