Liberty 4 nc microphone issue windows 11

The microphone of my liberty 4 nc headphones are not working on Windows 11.

Listening to sound is no problem but no voice input.

I tried already the following:

-selecting audio input from Bluetooth manager
-Updating Bluetooth drivers windows 11
-Updating audio drivers windows 11

Using other Bluetooth headphones works as it should

Anyone experienced the same issue and found a solution for that?

Kind regards