I tried re-publishing my app today based on your post, but the error is still there.
I've got version 3.19034.10 in the iOS and m y Canvas Studio session details are:
Session ID: d3667108-b5e7-400e-8c76-77bc7c723525
Well, rolling back to a previous version (via publish) does clear the error, so there's some correlation between publishing and the error message.
Having said that, I'm not being offered any chance to update the app by the App Store, so I guess I'll just wait.
https://itunes.apple.com/us/app/powerapps/id1047318566?mt=8 shows me "Version 3.19034.13" Is it not showing the latest version for you yet?
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