New APP Issues

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Go to More > App settings and verify each phone is connected to the correct virtual device on the hub.

Go to Home > Tab Hub Name at top > Switch to Another Hub
Re-select your hub and it should auto-select the previously selected device (if not select it again).
This will reconnect the app to that device.

If still not working after that you can try this procedure where you let the new app app create a new virtual device on the hub.