I am facing this problem. I have samsung s22 ultra with smart view cover on it. When I try to receive whatsapp call on my Galaxy watch 4 classic or my samsung galaxy buds. The caller cannot hear me. Once I open the flip cover and whatsapp calling screen is in forefront the caller is able to hear me as soon as I flip close the cover or the whatsapp screen goes in background the mic is muted again. As long as I keep the flip cover open and whatsapp screen is on the forefront it works. I have checked all permission are ok. Even tried reinstalling whatsapp the issue persists.
However if I initiate the whatsapp call from phone and then transfer it to the watch or buds it works fine even if the cover is closed or the whatsapp screen goes in background.
Normal mobile network calls are working fine both ways.
