Hello Abhishek
Im Juliet and Im happy to help you :)
I'm sorry to hear that you're experiencing issues with your Bluetooth microphone on your Windows 11 device.
I would suggest you also try to Check the microphone settings. Please follow the steps below;
a. Right-click the sound icon on the taskbar and select "Open Sound settings."
b. Under "Input," select your Bluetooth headset as the default microphone.
c. Check the volume levels and make sure the microphone is not muted.
I hope this helps! Let me know what happens :)