We would like to know more. Go here: https://www.youtube.com/features > Click on monetization and share the screenshot of the page that you see. This would help us look into the issue better!
Thanks for the info. If you're eligible & applied before June 1st, you should be receiving an email update in Creator Studio with more info. Also, if your application is being held for an additional review, you'll get a second update soon. Latest update: https://goo.gl/32dvTX