I am facing an unusual issue that while developing app when try to instll it from
Partner Account-> Apps ->Selected App -> Test your app -> Select Store
Upon installation I don't receive CODE parameter on my redirect_uri but receive hmac, shop and timestamp
and the problem is without CODE we cannot generate access token so the app will not work
The confusion is I receive all parameters including CODE when install the app with url string like
and app works fine
So when I submit the app for Approval they deny with eligation that installation failed.
Are you still having trouble with this? If so, please provide a shop URL and rough timeframe for when you observed the missing parameter, and we can investigate further in the logs.