So after 2 calls and a couple hours with Disney Anywhere Tech Support, we found out that:
1) Due to the iTunes requirement, you CANNOT link Disney Anywhere with your Apple account from your iPad or iPhone (regardless of what Tech Support tells you)... you MUST do it from a computer WITH ITUNES INSTALLED. If Disney Anywhere Tech Support tells you that iTunes is pre-installed on all iPhones and iPads so it should work, they are WRONG!
2) Several combinations of PC + iTunes didn't work for me:
Windows 7 Professional (64-bit) + Chrome 41 + iTunes (64-bit) = NO GO
Windows 7 Professional (64-bit) + IE 11 + iTunes (64-bit) = NO GO
Windows XP Profesional (32-bit) + Chrome 41 + iTunes (32-bit) = NO GO
Windows XP Professional (32-bit) + IE 8 + iTunes (32-bit) = NO GO
Windows XP Profesional (32-bit) + FF 10 + iTunes (32-bit) = NO GO
Windows XP Profesional (32-bit) + FF 34 + iTunes (32-bit) = OK!
Apparently the trick is to have the browser successfully call on iTunes to activate the authorization prompt in a separate pop-up window. I am not sure why it's so difficult for Windows users to have this happen, but apparently according to Disney Anywhere Tech Support, they had no problem getting the proper windows to pop-up on a Macbook Air.