If your keyboard is detected as a mouse and does not function properly on your PS5 console, would you kindly double check if there is an update of the firmware available in GG for the keyboard - this issue was addressed with one of our past updates!
To do that, you will need a Mac or a PC with our software installed:
https://steelseries.com/gg
After the update the keyboard may still be recognized as a mouse, but it should function properly on your console.
Please note that the keyboard needs to be plugged in via 2.4Ghz connection to the dongle, as PS5 does not support Bluetooth accessories.