Monetization can be disabled for several reasons. Here's more about it and what to do if it was an error: https://goo.gl/cNar2n . However, you can reapply after 30 days. Hope this helps.
@TeamYouTube dear team YouTube why disabled my monetization tab Please review my channel and enable my monetization tab Thank youpic.twitter.com/k1NtuiolxP
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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