Json Deserialization not working after app publish in store

Let me recommend this - build a debug version with lots of logging in it and upload to the beta store for testing. It's not an optimal situation, but I think it would help here.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.