I've got a working mesh network using a cloud based controller. These were adopted to the controller by the vendor (broadbandbuyer). I've now purchased two more, and am trying to link these, but they don't appear as "pending" for more than about 3 seconds. All of the instructions and support cases i can find relate to hardware controllers.

No support teams have been able to help as it's a Saturday; this is for a charity event tomorrow!