If you haven't heard back yet, this usually means your channel is being held for additional reviews (bc your content is close to not meeting policies). Take another look at YPP Policies & you can use this time to make updates. More here: https://yt.be/help/YPP-review
If you upload content from multiple sources, or reupload/repurpose someone else’s existing content (ie “reuse content”) then you won’t be eligible for YPP. Check out the FAQs and best practices here: https://yt.be/help/reused-content … and you can always reapply in 30 days.