We don't support sideloading the production version of the application. The vast majority of MDM solutions allow customers to distribute and configure app store applications even if the user is unable to use the app store themselves. I've never used MobileIron myself, but I assume that's the case for it as well.
Most large organizations don't provide their native applications outside of the app store. For iOS it's a contractual issue where the license prevents companies from providing IPA files for distribution outside of their organization without using the AppStore or TestFlight.