Load Cronus PRO and go to Tools > Options > Device
Set the Output Protocol to XB1.
These are also the recommended default Speed Up Settings for Xbox One Controllers. Rumble Over Bluetooth is disabled as it's not being used.
You can now close the Options window and disconnect your CronusMAX PLUS from the PC.
If the LED on the CronusMAX PLUS does not change from AU to a number then the authorization controller is not authenticating. 9/10 we find that this means the Micro-USB cable to the controller is faulty or not full data or simply not compatible, you should try another one. Another issue that sometimes comes up is that the controller USB port has a loose data pin. It will charge fine, but won't transmit data. Also make sure the controller is powered on of course - that's a rookie mistake.
If you find that the controller disconnects or kicks back to AU at random times, and you are sure everything is setup correctly, then the USB cable is obviousley losing its connection between the Xbox One controller and the CronusMAX. This can be caused by a poor quality USB cable or the USB socket on the Xbox One controller itself is loose. Check all connections and replace any parts if necessary.