I believe you can select AO = 3 it should be the same as 7 in some firmware versions. Your looking for this setting “Explicit+ZDO”
I am sure you have read these 2 threads but there is a bunch of information on Xbee and some of my own experiences with them to possibly help you.
I know when 1 was having issues getting smartthings to see my module it was a setting for " I think parameter D6" been a while since I have messed with these.
I have also had to load the default firmware and power cycle Xbee, Then load the firmware I wanted to use and reconfigure all the settings again to get it to connect again once it had before.