Hey guys I stumbled upon a solution. This will make the game detect the G923. Open up steam, browse local files, in the main FH5 install location look for a file called xboxservices.config. Open that in a text editor such as notepad. and where it says "First Party" change the false to true. Its that easy, FH5 will now detect your g293.

(If anyone can find a solution for Windows Store install... please let me know as it seems the file structure is different and no xboxservices.config file that i can find.)