@patrickheneise Weird -- I dowloaded the Sonos app, clicked through the Bluetooth and LAN dialogs, then went back to the Flic app and it worked perfectly. Not sure how long that would have taken me to figure out myself. Thanks!

I’m afraid I can’t provide any assistance as I am experiencing the same problem. I’m using a 2A power supply, and factory reset the Hub LR, but when I flip the HomeKit switch it almost immediately fails with HTTP error 500. I’ve been trying for a couple of hours now. The hub has a network connection on both wifi and Ethernet (my router sees it easily), and there is no problem with the Bluetooth connection between my phone or the Flic buttons.