InfoPath Dev

Data from my REST data connection displays fine in preview mode but nothing is shown when the form is displayed as a web form from within SP2016. No error codes or like just blank drop downs. My rest address works fine if I paste it straight into the browser this returns the expected data. http://mysystem/_api/web/lists/GetByTitle('postcodes')/items Unsure where to start to resolve this?

I'd drag the entire data connection onto the form so you have controls bound to it, and add a button that runs the query. Open the form, click the button - what happens? Hopefully you get an error w/ a correlation ID - which you can then give your SharePoint Admins so that they can investigate the ULS logs. :)

 Thank you Hilary will give this a go