To use your Windows 11 PC as a Bluetooth speaker, head into Settings > Bluetooth, turn on "Bluetooth," click "Add Device," and pair your device. Download and install the Bluetooth Audio Receiver app ...
I have had so many weird problems with Win11 and Bluetooth... Unpair, reboot, repair. If that doesn't work, check Windows update / additional updates to see if there's a driver update. If that doesn't ...