Cisco vWLC and 2600aps Mesh Backhaul issues

I am running a Cisco vWLC and a few 2602i access points in a mesh setup. It’s working as intended except for 5ghz. The backhaul is using the 5ghz fine and client access is enabled on backhaul but no clients can connect to it. I have turned off the second radio on the root ap to do a test and shut down the MAPs and the SSID shows but the client can’t connect.

AP shows access is enabled on the backhaul radio.

I have also put the AP into flexconnect mode to test and then clients can access 5ghz.

Any one have some insight into this? Perhaps it’s something terribly simple or maybe the 2602s just don’t support it?

Any debug commands I can run on the controller or AP to see why the client isn’t able to connect to 5ghz?

Thanks.