Using fobs with Galaxy 18 alarm?

I have a Galaxy 18 alarm and after getting bad service from ADT I decided to manage the alarm myself. I had to do a factory reset.

I've run in to a couple of problems and reading the engineer manual has not helped. The most important one is that I want to set the key fobs to work again.

I can add users, change levels, set PINs, etc. But I can't work out how to set users up with their fobs again. We have one main key panel at the front door and in-built is a fob reader. The manual suggests setting MAX number and such like. I have MAX enabled and I have tried setting a couple of different users with different levels (2 and 3) with a fob using the number written on the fob. I have set the MAX function to Timed Set. But when I hold the fob to the keypad it makes one short beep to say it's seen the fob but does nothing.

What I would expect is to be able to go to user codes and program in a fob by putting it in learn mode and holding the fob. But I've not used Galaxy before.

Any ideas please?