Okay, So I have seen multiple issues(answered and unanswered) regarding Instagram API, haven't found anything related to my problem.

I have made an app in iOS which lets users download only profile pictures of any Instagram user in HD resolution.

After a long struggle, I have found all of the related API's And I am able to get the HD variant of Profile pictures in the app. Now the thing is those APIs read the phone's browser cookies that if I have authenticated the user in Instagram or not. And if I don't authenticate before the HD profile query id doesn't give me the desired data i.e no HD profile Url.

It means that I can only get the Instagram authentication before letting my users search and query for the HD profile pictures. So I figured out and added that using Instagram Basic Display API.

The problem came when I submitted the app for the Facebook developer review. They keep saying that Instagram profile permission(s) should not be used to authenticate new users in your app.

And it's the 3rd time I told them that the app flow requires the authentication just to read cookies and I am not using any of the user's data for personal authentication, but they are not letting the app pass the review.

My need is can someone help me out if I am really using the wrong authentication process or maybe I am not able to convey my need to the reviewer. So what do I tell them, I am sure there is something going on wrong because I have seen some apps doing the same process in their apps.

Thanks for helping me out