Cannot download apps or login to app store on ipad

Question

Hi everyone.
I've moved my family over to family sharing instead of having everyone on my ID.
All working OK except my sons ipad air.
Cannot download apps (put in password and it just goes straight back to the 'get' button, no error message)
Have tried:
forcing ipad to shut down.
Logging out of store.
attempted to download app whilst logged out of store. Still same problem.
Tried my ID to login or download. Same problem.
Have checked family settings to make sure he can download apps without asking. All OK.
Apps are age appropriate.
Restrictions are set to allow apps to download
time settings are on automatic
Forgetting network and setting it up again.
using phone as hotspot didn't work either
Now a further problem:
Logged out of iTunes and App store. Cannot log back in on his ipad. Works on his phone and my computer, so the password and username are 100% correct.
Does anyone have anything else I can try?
Thanks, Zelly

Answer 1

I Am having The exact same issue.  I know my Apple ID is correct.  I can log in to anything from safari or on a computer, but cannot log in to the App Store. When I click on download, it asked for my password.  I typed it, and it asked again (no error message).  I typed it again.  It asked again.  I typed it again and then it asked if I wanted to use an existing I'd or a new one.  I clicked existing.  Typed in my email and password, clicked ok.  Then it asked me again... Existing or create a new one.  This happens every time now.
steps I have tried:
I tried to reset my password.  No good.
I tried logging out from settings and logging back in there.  No good.  (In fact, in settings, it won't even let me TRY to login.  I click on the blank Apple ID box and it asks if I want to use an existing or create a new one.  I click existing and nothing happens.  No option to login at all.)
I tried resetting all settings.  No good.
I tried a full reset (all content and settings). No good.
I tried resetting DNS.  No good.
I Tried multiple different networks.  No good.
if it matters, I do have a MDM device that is set up through my work's Active Directory.  But it worked fine a few days ago before upgrading to iOS 8.3.
WHen I did the full reset, I was able to login to my work's configuration, but when it got to the set up Apple ID menu, I had to skip it because it still would not let me log in.
aany ideas?