bluetooth microphone does not work in ubuntu 20.04

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I have ubuntu 20.04, I can connect different bluetooth headphones, the audio works. But not the microphone.

Internet solutions are based on editing the alsa-base.conf file based on the audio driver. But I can't find the settings for my pc

cat /proc/asound/card*/codec* | grep Codec
Codec: Nvidia GPU 9e HDMI/DP
Codec: Realtek ALCS1200A

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