Help please! I'm the OP of this thread: https://www.geekzone.co.nz/forums.asp?forumid=66&topicid=322739

I'm now a proud owner of a GWN7002 and 2 x GWN7604. The idea was to set up one 7604 on PoE downstairs, and one 7604 wireless with a power adapter upstairs. I can probably connect both over PoE but prefer not to because the PoE cabling terminates upstairs in a bedroom instead of the office, and I don't want to rewire the house.

Problem is - I can't get the APs to sync with the GWN7002. All the manuals tell me that there should be a "Discover AP" button on the AP page in router UI, but there isn't one. I can see all 3 devices in the GWN app, they're all in the same network and group, and I've setup a WLAN that all three devices are members of. But none of that does anything - the only SSID I see broadcast is the default one for one of the 7604's. 

Here's what the manual tells me I should be seeing, and here's what I see in the UI. When I click on either "Pair" or "Takeover" I get "No APs available".

Any ideas on what I am doing wrong here?