This is also happening to me, I applied for an iPhone xr contract phone with airbuds on Friday and received the confirmation emails stating to wait 24 hours and watch my emails and listen out for a call to say if i had been successful.
I haven't received any further emails or calls and when I've kept checking back on my account it says something's gone wrong and I can't sign in.
Hello, I Ordered a phone and haven’t heard anything back about it. Tried to log onto my account and it’s saying something went wrong. I’m in need of a new phone so need to figure out what’s happening or I’ll need to look elsewhere for another deal!