Moes 3 gang light switch wont go into pairing mode

We have installed 3, 3 gang moes smart switches (glass front). We haven’t been able to get them into pairing mode. We have followed the instruction. Power down then switch on off 3 times ect nothing is happening. We are on the 2.4 ghz wifi
We can uses the lights on manual to turn on and off and dim.
If anyone has any advice I would be very grateful. As I’m now stumped.
Thanks in advance
Kate.