Heart rate sensor and cadence sensor not connecting

I use a Wahoo Kickr (connects perfect) and the Garmin sensors that came with my Garmin Edge.

The heart rate and cadence sensors do not connect properly, the Device Management  screen keeps saying "Connecting".

If I usecthe same senors in Zwift they connect without any problem.

Batteries are fresh, my Tacx Ant+ sensor is working fine and is no further than 1 meter away, probably closer.

Sometimes if I start a training anyway, cadence and heart rate is properlt displayed, sometimes not.

Pretty anoying.

Any suggestions?

Thx, Rob