Neikyu

Hey guys, I bought the k95 rgb platinum on primeday on amazon. I got it delivered today and everything is working fine expect the key "d". The RGB is working fine even on this key but when i click it, its not working. Now my question is, do i have to do some software uptade or maybe the key is not even set ? If so where do i have to go to look it up ? Or maybe some other tips ? Because i feel like i have to send it back and get a new one. thanks in advance