When I try to bind keys to mouse buttons nothing happens, i am able to bind the the mouse wheel, but nothing happens when i try to bind the buttons on the side of the mouse.
I am able to bind these keys in retail so not sure why it doesn’t work in classic
I might be wrong here, but I do seem to recall that when I played vanilla wow all those years ago, you actually couldn’t rebind the mouse buttons, only the keyboard keys.
You’re not able to bind them at all via the keybind interface or you’re not able to interact with unit frames using them? The 2nd is expected behaviour, you need an addon like Clique to cast on frames using mouse clicks.