Do all layers belong to the same portal or are authenticated with the same credentials? Does running it in the editor behave differently from the packaged app?
Theoretically if you authenticate the first layer, the other layers should load without needing to authenticate again. One thing you could try is to add the oauth configuration only to one layer. The issue here is that the order in which the layers are loaded is not guaranteed, so you may need to programmatically make sure the layer that has the oauth config is loaded and authenticated before adding the other layers using the API.
Another thing you could try is to modify `SampleOAuthAuthenticationChallengeHandler.cpp` to open the browser only for the first Challenge issued. You could for example have a queue that contains all the pending challenges and apply the result of the authentication to all the pending challenges that belong to the same portal.
We are working on improving the authentication workflow in future releases and this should not remain an issue. But we do appreciate any feedback on this and other issues related to authentication.
