Hi, I am facing the same issue of the app not getting loaded in the iframe after installation. I am using a client-side rendering for my react app. The /shopify/callback endpoint in the app setup performs oauth, fetches and saves the token in a database and does a redirect to the react app. Soon after installation, I see an error inside the admin dashboard that the path is not found (figure attached) My react app URL takes shop=<shop name> in the route. I had to do this inorder to fetch the shop name and use it while storing the tokens in an internal database. Please tell me what can be done differently here so that the redirect inside admin dashboard works properly.
... View more