By chance, did you already try going through these steps to get help signing in: https://goo.gl/v7CdWx ? Let us know if it helps.
@TeamYouTube don’t have access to old phone. new device not letting me sign in!!!!!!
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Google couldn't verify this account belongs to you" i know the password and email, i’m just on a new device and i have no access to the original device.
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