I will ask something maybe not quite obvious. But do you have devices to act upon? For example, I have a couple buttons on my test hub, but no switches or other items that can be controlled. I get the same behavior as you do.
You also could try this in Rule Machine, it has a built-in button controller, but not quite as easy as the dedicated button controller app.
The other advice I give with Button Controller is that you should try the community based Advanced Button Controller. It is much nicer and easier to use. Maybe see if that works for you?
