Unable to update apps on iPad due to '@temporary.appleid.com' account

I am unable to update any apps on my iPad. Though my Apple user name is correct, when I go to update anything, it brings up a wonky account that ends with "@temporary.appleid.com". I tried to sign out and resign back in and also click forgot password (which since it's not account I access anymore isn't a help). It's every app that needs an update. Where do I go next for a solution?

[Re-Titled by Moderator]

Original Title: "Temporary" apple account