Have you tried to unlink Twitter from your YouTube channel? Here's how: https://goo.gl/2HcPNH . Let us know if this helps!
Theres also a settings option for what they want you to send. I believe it will by default send a tweet when you upload, like a video, or add a video to playlist. The page where you connect your twitter has those settings I think.
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No problem! Honestly surprised YouTube themselves couldn’t tell you

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