I'm trying to add AAD Application Proxy settings to an existing enterprise app registration. I suspect this app was registered differently than others I've configured App Proxy for. On the "Single Sign-On" screen the disabled and SAML tiles are there, but not the IWA or Header tiles. On the "application proxy" screen an error message that says, "Unable to complete due to service connection error. Please try again later." is shown. Any idea why this app is missing or erroring on these screens and if it can be changed to get these settings to work?