EP-T21 and A2dp feature

From EP-T21 description I saw that are A2dp (able to connect with multiple devices) and thus I decided to buy them.
Now since several weeks I’m trying to get them connected both to my phone and notebook and be able to pick up phone call or Teams call either from phone or notebook without success.
I can use either Phone or Notebook but always I need to disconnect from one and connect to the other.
I was not able to find instruction on manual on A2dp connection. Any suggestion? Anyone has instruction on how abilitate A2dp connection?