I recommend you get additional details from Google regarding the reason you are having an issue. We are not experts on store policies and are unable to help you with this issue. I suspect they may consider you to be infringing on copyright or license terms with YouTube (this phrase "accesses in an unauthorized manner the devices, servers, networks, or other properties or services of any third party"), but to be certain you need to speak with them or with someone who has the appropriate legal knowledge.
he told me that my application allows reading in background youtube videos . I searched how to disable it knew intel xdk but I have not found . I found this feature during the test on my application and I found it interesting but I did not know it was forbidden on Play Store. I use an iframe in my application that allows me to view the mobile version of my website.