Here's an additional guide that may help you regain access (it covers more scenarios): https://goo.gl/q2Ijwz . Hope it helps.
@TeamYouTube I have an old account, that has only one video of me, 13M views & 20K subscribers to which I have lost access many years ago& there is NO possible retrieval! I can prove my identity to you somehow, I am in that specific video. What can we do? Thanks
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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