Sony WH-1000XM5: audio output works but microphone is not even listed and does not work

Hi i have recently bought a Sony WH-1000XM5 headset. I was able to connect the headset with the bluetooth app shown in my kde plasma 5 taskbar. The audio works (i can listen to sound) but the microphone is not. It is not even listed when i open the audio configuration, it lists multiple output devices (including the headset) but only one input device (my webcam microphone). Are there any additional steps needed to enable the microphone?