I moved into a Lennar home with two R510 and a ICX7150C12P. I have connected to the Master R510 and could never get the the other one to work, so removed it from the dashboard. Now, I have no idea how to get it back. I reset the missing one and still nothing. Any help would be appreciated.
If one AP is up and running, that means it is acting as Master. If you need to connect the other APs to this Master, all you need to do it factory reset the AP, once the AP resets, it will try to look for an existing master. Once found it will join.
We need to make sure that both the APs are on same firmware.
Do you have a router and DHCP server on your LAN? Do you see both AP MAC addresses in your lease table? Look for an open auth Configure.Me-XXYYZZ ssid, meaning the APs do not see an Unleashed network created yet. If you join that SSID, and open a browser to unleashed.ruckuswireless.com, you should get screens to help you further. When one of your APs creates the Unleashed network the other should be seen/join/upgrade if necessary ok.