I have an application that I'm beginning to deploy to users and I've run into an interesting situation. If they launch from the desktop app on Windows 10 or mobile device, it runs correctly (mostly) - there are some entry fields that don't populate correctly when you run the app, but populate correctly when in 'preview' mode. (I'm logging a different issue on this)
However, if they go to PowerApps on the Web and try to run the application they get the following error:

If I open it in EDIT mode using the Web App and then go into 'Preview' I'm able to run the application. Has anyone else seen this?
Thanks-
Tom.