For those that can log in with facebook now, if you want to avoid this problem in the future, you can now switch it to an sts account via Nexus -> My Account -> Modify Account.
There's one bug here that I couldn't fix without an app update, but that you can work around. If the last sts account email you entered at the login screen is the one you want to switch it to, it won't work. Just log out and clear out the email field and it should then work.
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