Ap should remember set scg IP after moving it to different location, switch and so on. This setting isn't lost after reboot.
You can always check this setting using command
Command will report current SCG IP settings, connection status, last connected scg IP, and received from DHCP option 43 scg IP (if any is supplied).
Or you can use
get scg ip
This will report configured scg list on AP.
So if this setting is not persistent, I think command isn't executed and returns an error, because you have not scg version firmware (output is: command not recognized or something similar). In this case AP is unable to connect to scg in any way.
If you have ZD firmware, the command is
get director ip
If you get output on this command, than you have ZD firmware on AP.
Also, if AP is to be converted from ZD to scg firmware, you need to reset it to factory(reset to factory) , upgrade to vsz firmware, and than reset to factory again. Than you can configure it as needed.