Can't check 'Phone Audio' setting for a Bluetooth headset

Question

Somehow, suddenly I can't hear phone calls with my Bluetooth headset - I don't know what happened.



I tried to check the Phone Audio option under the device's 'Use for' settings, but it is impossible! It can't be checked.


— Adi Madar | Sources

Answer

— Laszlo Miklosik | Sources

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