A window could not be opened. This may be because of browser popup-blocker settings. One possible solution is to only start login in a user interaction event (such as onClick).
The user finished the login, but closed the window. Normally, this would work fine, but some browsers block attempts at requests as a window is closed. This error should be very rare. The user should guided to reopen the login window and finish with the appropriate button instead of closing the window.
An undefined error caused the login process to fail.
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The user aborted logging in by either clicking cancel or by closing the window.