I figured out the solution. The MilliKey buttonbox is a NUMPAD button box, not a number row button box. If you want it to read the inputs “1,2,3,4” (its default config) on mac, instead of putting the keyboard allowed inputs as 1,2,3,4, use ‘num_1’,->‘num_4’. I know I am new here, but this wasn’t really documented anywhere, and I only found the solution by plugging in a ton of keyboards.