Can't create an account – Map My Fitness by Under Armour Review

I have a MyFitnessPal account that I have begun using with no issue. I have linked my Facebook account to it. Apparently, that's as far as the devs can get. Whether I link through FB or sign up independently, I get a "Cannot create account" error. After a dozen tries this became an uninstall for me. If I can't find a mapper that links with MFP then that likely will need to become an uninstall for me as well. Lame.
Review by Kajamma on Map My Fitness by Under Armour.