I had this same problem with my kids child account. This is how I fixed it
-From the parent/master account go to settings
-Then go to parental controls/family management
-Click on child’s account
-Under Parental Controls select Applications/Devices/Network Features
-Under Network Features, make sure the setting entitled “Age Filtering for Online Content” is set to “Off”
Once this is done games should be playable online. Good luck!
I got excited by @Botson24's suggestion because I original had age filtering on. Turning it off, though, had no effect, the same as @dopey_originid's experience.
This an annoying feature to Battlefront II.
