My problem is: how to submit my App to Facebook Review with Test Users in order to allow the Facebook Reviewer to see that it works with the "Instagram Public Content Access" feature?
Now, to detail my problem.
During the development phase of my app, I used an Test App (https://developers.facebook.com/docs/apps/test-apps/) and Test Users (https://developers.facebook.com/docs/apps/test-users/) to access the "Hashtag Search API" (https://developers.facebook.com/docs/instagram-api/hashtag-search/, which requires the "Instagram Public Content Access" feature - https://developers.facebook.com/docs/apps/review/feature#reference-INSTAGRAM_PUBLIC_CONTENT_ACCESS). That worked fine: I have Test Users on the Test App that can use my it the same way as my final users will do.
Now I'm trying to submit my "Production" App to Facebook Review in order to get the "Instagram Public Content Access". If I submit the Production app to Facebook Review, I can't select any of the Test Users from the Test App on the submission form (I can only select Test Users from the Production App). If I create Test Users on the Production App, these can't use the feature (I receive errors saying that I need to pass it through the App Review first). And if I don't provide an Test User on the submission form, the Facebook Reviewer will be unable to test my App, and probably will reject the feature request.
So, how do I setup my App Review submission in order to allow the Facebook Reviewer to test and authorize my Production App? I need to submit the Production App but my functionality only works with the Test App.