UPDATE..... I don't know why this worked, but... I changed my password. Perhaps it was too long - I don't know. Deco had accepted it, so it shouldn't have been a problem. Anyway, I'm now connected....

Hi, I set up my Deco M5 using my mobile, and all three decos are up and running, with green LEDs. The trouble is that none of my other devices can connect to the network. It shows in the list of...