GIANT Talon E+ Ex power measurement way too low on the Edge 830

I recently bought the a.m. bike, looking forward to using the built-in powermeter to show my actual and average power on my Edge 830.

The GIANT RideControl App (connected to the bike via BT) shows correct power data, but my Edge unfortunately doesn't. I had used it with GARMIN's Vector 2 on a different bike for a long time without any problems, but with the built-in powermeter of my new e-bike it doesn't work at all. The power readings are way too low on the edge. When I cycle with 200W, shown correctly in the GIANT App, the Edge only displays around 50W, for example.

Anyone else with this problem? What could be the solution to this?