Hue Motion Sensor showing up with last activity 54 years ago in Homey Pro 23

I bought and connected two hue sensors to my home yesterday. The sensors show their activity in the Hue app. I added them to my Homey Pro 2023 through the Hue app, and they do show up there, but the sensors show as “last activity 54 years ago” (01-01-1970?). I have no idea how I get them to communicate, not even where to start debugging… Any hints from the community?

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