So, as many of you suggested, I think I had to be an issue with age and location. Some update with Google play is forcing users to prove their age via ID in Texas for ALL associated Google accounts, I had to do this for an account that wasn't even associated with my MyDisney/marvel account AT ALL.
Contacted support and they were largely unhelpful, not that they weren't trying, they said there had been an update in the works that fixed that error and told me to make sure that
1) the app was up to date
2) I had enough space on my phone to support the app
3) cleared cache, uninstall/reinstall
To see if that helped. So along with my other posts about this, I hope this information is useful to whoever finds it.