Create a file /etc/pulse/default.pa.d/cancellation.pa

.ifexists module-echo-cancel.so
load-module module-echo-cancel aec_method=webrtc source_name=echocancel sink_name=echocancel1
set-default-source echocancel
set-default-sink echocancel1
.endif

On your desktop console:

pulseaudio -k

• https://www.linuxuprising.com/2020/09/how-to-enable-echo-noise-cancellation.html