Applications for the YouTube Partner Program are still in backlog. We've high volume of appeal requests and we hope to review all open applications by the end of June. More info: https://goo.gl/pwuBWY . Appreciate your patience in the meantime.
You should have received an email and a notification with more info in Creator Studio. Take a look at those resources and note that you can always reapply for the YouTube Parter Program again in 30 days.