Symptom:

On Windows 11 the sound quality on my bluetooth headphones has degraded quality.

Fix

Bluetooth headphones that come with both a mic and headphones sometimes load a profile that have both the mic and the headphones turned on. In some scenarios this can degrade sound quality. If you are just using your headphones for listening you can turn off the mic. On Windows 10 you would see two bluetooth profiles for the headphones, one with a mic and one without. On Windows 11 you need to go to Sound Settings -> Manage Sound Devices and change the Input to a different microsphone

. Upon doing the quality of the sound from the headphones output will return to a higher quality output. You can also reach this menu by click the sound icon in the notification area, then clicking the right arrow, then clicking More volume settings.