Issue with mouse keybinds after SB release

Hey there, so I've been having issues with my mouse since Stormblood's launch. Before launch I had keybinds set to my extra mouse buttons (Mouse-4, and Mouse-5 (utilizing shift/ctrl variants as well). It is my preffered set up for some of my hotbar buttons.

Come the launch of Stormblood's Early Access period, and even til now, my mouse keybinds (mentioned above) would not work at all. I ended up changing them to other keys to see if that would work and they did. I ended up trying to change them back to my mouse buttons to get an error of: "Commands cannot be assigned to that key."

Now I've tried everything, uninstalling/reinstalling the driver, going into the driver software to set the mouse button as the new keyboard keybind, downloading another program to try and do that all to no avail.

I've talked to other members in my FC who say that they're mouse buttons still work for keybinds so it has been a little frustrating to say the least.

For reference, the mouse I'm using is a "Gear Head USB Wireless Optical Nano Mouse".

Is there a fix for something such as this, or am I stuck having to learn new keybinds now?

Thank you!