Even if you have permission, you still need to add your own unique, creative value to be eligible for YPP. You may want to check out the FAQs and best practices here: https://yt.be/help/reused-content …. If you make changes, you can always reapply in 30 days.
in short, if youtube think your not being creative, no matter if you have spent timeon your own content, they will stop you. its basially youtube beign youtubeand their own actions are slowly killing their own platform for the much larger accounts bringing in the real dough