Okay Dracfalcon, your keyfile worked, the buttons on the tablet registered, loaded it into the sim and it worked there too (but screwed up my HOTAS assignments). When I loaded in my keyfile and tried the tablet buttons I got the Key does not match error. I selected key assignments for all the yellow lines (trial and error till I found one available) but still got the same error. Also your file seems to have a lot of command conflicts, how do you get it to export? (or not using BMS keyfile editor?)
Thanks for helping me with this issue, I guess the eventual resolution will be valuable for others too.
oilmanzz, have you tested Conrad Traxx solution in post #761? Basically replace all “0x” in your keyfile with “0X”. Had the same problem as you and this solved it.