The same thing happens to me, without having 2-factor authentication on.
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https://bugs.launchpad.net/bugs/1241084
Title:
adding facebook account fails
To manage notifications about
*** This bug is a duplicate of bug 1222586 ***
https://bugs.launchpad.net/bugs/1222586
** This bug has been marked a duplicate of bug 1222586
Gnome Online Accounts and Empathy don't connect to Facebook
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-online-accounts (Ubuntu)
Status: New = Confirmed
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