While we can't get into the specifics, have you tried reaching out to our Creator Support team: https://goo.gl/BxLi8H ? They can dive into this further with you. Hope this gets resolved.
@TeamYouTube Hi, I applied for YouTube TestFlight on Sunday and haven’t had an invitation yet, is this normal? I verified my email address, via the link in this email.pic.twitter.com/ZYJ85iQ9IA
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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