what do lldp from the ap report? I've been into troubles where connecting to lldp-avertised mgmt-ip was possible (and got a case now where it does not seem to work).
What error you are getting in events (screenshot provided by you is too small to read the content in it)?
Do you have other R710 already in working on this vSZ?
Disable the AP auto approval on vSZ, delete the AP entry from vSZ and now factory reset the AP. SSH into the AP CLI after factory reset and check its firmware version (get version).
I was install vSZ firmware 5.1.2,5.0,3.6,but still not work If factory reset the AP, i can search ssid name is "Island-XXXXXX",but i don't know the password connect this ssid,ssh https still disabled