@kerry-thacher this is what seemed to work for me.
I started a process of adding a new profile to allow logging, and when I restarted my Apple TV (that is what I use as my home hub) it seemed to stop the error and can now be configured!
Hope that works / help you as well
James

I tried adding a flic button to my hub. I went through the process and turn HomeKit on.
When I go to home and try to add an action (with any HomeKit light etc), I get "could not change settings" and "Could not complete operation"

I reset the button - and tried again. unfortunately not working.

Any suggestions? (I dont want to reset the hub as I have many buttons)

My bank fixed the issue - thank you