edge explore 2 don't receive hr from my watch

Hello

I just bought a garmin edge explore 2 but I can't get heart rate from my watch.

Garmin can see the watch, but can't receive the data. It says deconnected.

BTW, the watch is a coros pace 3

but the watch works well, because i can send hr from it to my wahoo kickr core

Thank you for your advices