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Attempting to open an app created from a configurable app template via 'My Content > Create App > Using a Template' may result in a 404 error.
This is a known issue.
The ArcGIS Web Adaptor name is missing from the app URL.
Use an alternative workflow: open the web map in the map viewer and click Share. Select any template in the gallery to configure an app. The app created from this workflow is not impacted by the URL issue discussed in this article. For more information, see the help topic Make your first app.
A broken app can be fixed by inserting the Web Adaptor name missing from the URL. The instructions provided describe how to fix the broken app URL.