Magic keyboard keys won't work for volume
Ive just bought a new magic keyboard after rate original just stopped working for some reason.
I followed the instructions for connecting and it seemed to connect on its own, however, I can't get any of the F keys to work as they should. After much playing around, Ive managed to reassign the F1 and F2 for the brightness, but I cannot for the life of me get the volume keys to work.
Ive tried to follow advice that suggests unchecking the use F1, F2 etc, but I cant even find that option under the systems preferences>keyboard>keyboard? Im using an older (2013) Mac on Mojave, should I update to Catalina?
Really frustrating as I naively thought that by buying a genuine apple keyboard it would simply work as the older original one did?
iMac 21.5″, macOS 10.14