Hi. My MacBook automatically put on "prevent cross site tracking" - when I turned that off, I managed to sign in again without an error message. Turned it off again and still works 
Thanks for the troubleshoot, helped a bit
Hi there, just to confirm, have you tried signing in following the steps outlined here: https://goo.gl/MZ4Ss3 ? Keep us posted!
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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