Have a strange problem, have the S20 ultra and gw4 classic.
When I answer a call that's coming in and I answer via my watch it opens up the phone and also has the call going through the phone and watch, can hear the call on both but I can only talk into the phone.
If I make a call on the watch it once again opens my phone screen and goes to the native phone app and makes the call on the watch and phone can hear the other end on the watch & phone but once again only the phone I can talk into lol
Have searched the web but come up with nothing.
Btw my galaxy watch 2 active worked fine without doing the above 😞
This used to happen on my Galaxy watch active 2 funnily enough, on mine it would just say check phone. Never ever got to the bottom of it it just started working again. My only recommendation so far is back it up delete and re pair it