Hi

I have a problem with my Deco mesh system. It is working okay but it will not let me connect a new device to them.

When I scan for the WIFI the new device will see the network and says its available. But when I connect to to and put the password in it will not connect. I have reset the password, re booted the system, done a hard reset on them, Updated the system & I have set up a new Guest Network. But it will still not let the new device connect. 

I know its not the device as I have connected it to my Talk-Talk router and connected it to a hot spot network on my phone with no problems. 

Has anyone had this before?