I just received my hub + 3 buttons yesterday. Went through the process of adding a button to HomeKit, set it all up great.
First thing this AM I used the button to turn on my lights, fantastically simple!
However then my wife walks over, tries to double-click to turn off the same light, and she reports it doesn't work.
I check via Home app on my phone, and the button has the dreaded "not responding" message. I tried repeatedly to restart the hub, but nothing.
Finally I went into Home app, and removed the Flic Bridge. Assuming I could reset the hub and re-add it easily.
However no amount of holding down the reset button on the hub makes a difference. I can forget the hub, I can delete the button. But once I re-add them to my Flic app on the phone, and even when I toggle on the "add to HomeKit" option, nothing happens.
The bridge is still missing from my Home in HomeKit, and I cannot find any way to get it added back.