Razer synapse rebinds working in menus but not in-game?

[Kachunnga]

I use a mouse and keyboard (don't own a controller i'm comfortable with and that's fine with me)
My problem is that i use razer a synapse profile to rebind my mouse buttons to something Rivals allows me to bind actions to, but that only works in the menus for some reason. In training mode my mouse inputs go completely ignored. The same keys my mouse buttons are rebound to, when pressed on my keyboard (-,=, [ and ] ) are registered just fine and do what they're supposed to.

This's the first time i've ever encountered an issue like this in any game, i didn't even think this was possible. Anyone have a solution?

Or in the off-chance a dev sees this, could you (*lovely and beautiful*) people allow players to rebind actions to mouse buttons? I don't understand the benefit of not allowing that.