Uploaded my test project here (iCloud Drive link). It's basically the two code snippets above with some small changes.
With this sample, I was able to reproduce the "No ConnectionContext" error by running the App Shortcut within the Shortcuts app. Unfortunately it didn't seem like Siri was picking up on the shortcuts provider, so I never got the other error, nor could I reproduce the "No ConnectionContext" error via a Siri voice command.
And gotcha on the App Shortcut Parameters point. I don't think that was super explicit in the documentation - I understood that Primitive values should work and if I needed anything more complicated, an AppEnum or similar would be necessary. I appreciate the clarification.
DustinKazi
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Just to add a bit of additional context: The errors happen when I ask Siri to do the action specified in the phrases array. It seems like Siri knows that my App should handle this, but then stumbles after.