Cant connect Tacx Flux 2 to Fénix 6x pro

Have you tried to connect a smart bike trainer to a fénix 6x pro? Trainer works fine with my Mac (Ant and bluetooth), my edge 530 (ant) and even the Apple TV using Bluetooth but when I try to add it to my watch, it doesn’t find anything. 

Tried to search for all sensors and nothing happened, tried speed/cadence and power separately and still no luck...my friend tried with a really old Forerunner 920XT and boom...she found the trainer under speed/cadence and power sensors. 

Im using the latest beta firmware and the latest ant/ble/bt, sensor hubs (9.95/5.04/7.11 respectively)

thanks!