Public App Rejected for 'Add App' link

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I've received an email saying:
App must install successfully.
"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 but was redirected to 
Learn more about authentication in our developer documentation" Need Help: I can't find where 'Add App' link would be found even from here the Add link is disabled.
In our case, if someone wants to connect to Shopify mPonics App then it has to be from portal being as a mPonic user.
From portal once submitting a store link for the access token, it redirects to shop login, and then the attached screen appears asking whether installing the app or not.
Please guide me in the correct way as the app review can be accepted.  Where should I make the improvements.