Our keyboards use USB protocol while Apple's keyboard is using SPI protocol.
The difference is the USB protocol has a very wide capability. While SPI does not.
There is a solution for this Bootcamp.
1. If your computer is booting from a complete shutdown, just hold the "option" key on the keyboard.
2. If you are rebooting your computer, you need to repeatedly hit the "option" key to enter Bootcamp mode.