Venu 3 not connecting audio mode

My venu 3 works fine with my Samsung A55 except the audio assistant. 
When I try it, gemini appears on the phone, but the watch crashes "Echec à la connexion"

In Bluetooth menu, when I try to connect "watch" for audio, it fails after trying a few seconds, same for "calls" option
Tried deleting all previous Bluetooth connection, retrying connection, reseting devices. 
Something prevent the A55 to connect Venu 3 in audio mode.