Schwinn Indoor bike connection

Hello, I've a little problem for connecting my fenix 6x pro to my wife's spin bike (schwinn 800IC). When she get it, I've connected it to her Venu 2 in less than a minute, really easy. Then I tried to do the same thing with my fenix 6x pro, but my watch does not find the sensor... I also tried with an app (track my indoor bike) on my smartphone and it works well, but with this solution I don't have my heartrate... Does anyone know how I can sync my fenix with the spin bike? Thanks for your help