Bluetooth (or not) headset on rpi400

Manjaro on rpi400 with xfce. Kernel 5.10.25-3, pulseaudio 14.2-3 and bluez 5.57-1

I need to use a headset to join some online meetings.

I have a creative outlier working good via bluetooth as headphone with sink A2DP but it is not working like headset with profile HSP/HFP: I don’t receive any signal from microphone and to loudspeakers.