How do I get Pressure Sensitivity on my Pen + Tablet in GIMP?

[Im_Mr_Mapper]

So I've been trying to get pressure sensitivity going on my tablet using GIMP. I've read several tutorials on youtube and reddit on how to activate it, but after following them it still doesn't seem to be working for me. I've gone into Configure Input Devices under Preferences and turned set both my inputs from the tablet to "screen", and enabled dynamics in the brush window. Still nothing. The only thing that seems out of place to me is that when I go to enable them under the Configure Input Devices window, both my tablet options are greyed out (see attached image). I was able to still change and save settings, but the fact that the text was greyed out seemed off to me. Anybody know what I can try to get this working? Thanks!