I just received my second pro signature keyboard with the fingerprint reader (first was returned at Microsoft Support's suggestion), due to the computer never recognizing the fingerprint reader. I'm still having the same issue with the second, which confirms for me that the fingerprint reader on this keyboard is not currently compatible with the pro X, but I can't find that stated anywhere, only that they're completely compatible. Can anyone else confirm any issues, or potentially any fixes? Microsoft support previously spent about two hours working on it remotely and was never able to find a solution.