Hi @RonManning have you ever found solution to this?

Hi, yes we are trying to support non-public URLs. Correct, the app is in house VPNd app. We tried the developer mode in test setup and it seemed to work. However, we are deploying the from MDM - Intune. We tried using managed mode but following the sysdiagnose, there's no attempt from the device to get the associated domains file from the server. So the question is if we need additional config for Intune to support that? We have found a AssociatedDomainsEnableDirectDownloads key which apparently is supposed to be set in App Config in Intune, but this doesn't seem to work.