Hi, @JMB
Thank you for posting in Microsoft Q&A forum.
If I understand correctly, you added the return code 4 to the "Return Codes" tab after you deployed the application.
So it seems the clients do not recieve your change, you may try the steps:
- Remove the deployment of the application.
- Wait for an hour, the application will remove from the software center automatically.
- Re-deploy the application.
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