I submitted my app today and it was rejected. Later I made some changes and again got rejected. Here is what got in rejection notice:
Your app does not request installation on the shop immediately after clicking "add app".
Apps must ask a shop for access when being installed on a shop for the first time, as well
as when they are being reinstalled after having been removed. During install or reinstall
we expected Oauth to be initiated at
https://appstoretest5.myshopify.com/admin/oauth/request_grant but was redirected to
URL during Installation process:
URL after Successful Installation of app: