I wanted to configure a button with HomeKit to skip to the next song (on HomePod), but can't figure out how that's done. Anyone managed to do this?

I managed to solve it.

What's missing is the "Local Network" permission (in Settings->Privacy). I did a reset of the hub and re-installed the Flic App. After updating the firmware etc., I added "Sonos" to the providers (should work even if you don't have a Sonos system), then finally the permission dialog came up to "allow local network access". Once that's approved, HomeKit worked as well.

I'm trying for a few days already to connect the buttons to HomeKit. Whenever I trigger the "Enable HomeKit" switch, I get a dialog about walking through the process and then an Error 500 without any further explanation. Did a few reset cycles, logout/login, app delete, app re-install etc. but so far no luck.

What can I do to make this work / where can I see more about that "Error 500"?