HRM from garmin watch problem

Hello people!I’ve just set my Horizon GR7 after long problems and now i have another problem…this is my life…I’ve connected the bike with pm and all she have and then i connect my garmin fenix 7 sapphire as HRM ,i’ve done 2 workout and for both of them the hrm didn’t show any information.I’ve connected ZWIFT via STRAVA and GARMIN ,i’ve made the steps but the hrm don’t give any information,it’s shows as connected before i start the workout but when i finish my ride on STRAVA or on my GARMIN CONNECT are no data from my HRM.Any solution please?thankyou!