We recommend referring to the email you should've received about this. Also, here's our Help Center article which has more info on why monetization can be disabled on a channel: https://goo.gl/2HuVq6 . Hope this helps.
@TeamYouTube Feedback-
Dear Youtube,
Monetization on my Account has been
disable,Please look over my monetization
problem and please
re-enable my monetization settings.
Youtube channel link
https://www.youtube.com/channel/UCSeyPWuCSx_rvlC4yK8fz3A …pic.twitter.com/P6UMSIIrjA
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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