@YouTube @TeamYouTube I've had my YouTube channel for a few years and it says that it is disabled for monetization. It's not that it's not eligible (I know the subs and watch hours requirements). It just says it's disabled. The page for answering this doesn't help me either.
You should have received an email and a message with more info in Creator Studio. Take a look at the detailed resources and note that you can always reapply for the YouTube Partner Program again in 30 days.