I had the same problem and I think I just solved it.
I used the Gmail configuration (not Exchange), with firstname.lastname@example.org as username. But instead of my regular password, I used a Application-specific password.
Generate a new application specific password by choosing a name (like IPAD2) and click on the icon.
You will get a 16 digit code:
Use this new code as your gmail password while configuring your account on the ipad and it will work!!
I hope that works for you guys! Happy new year!