Sorry about that; your admin would need to enable that access. If you normally connect from your desktop machine with full VPN (Network Connect) then there is a chance you can connect with Pulse on iOS as well; but it is possible your admin has disabled that access intentionally or has not enabled the proper permissions for another reason (that I can't guess at. Sorry!)
For some reason I can not see Network Connect under Users>User Roles>roleNameForiPhone>Genera at all.
I'm using firmware version 7.4R8
Where would it be as I have exactly the same problem when connecting from iPhone using Junos Pulse.
I have managed to sort this out now following this document:
This doc is also very handy:
I was missing DHCP scope...