Hi All:
I used to build my client's enterprise app for MDM distribution through the following process that the client liked because he is not able to give me developer access to the company enterprise developer account.
1. I would build the target for "Generic iOS Device" using clients Enterprise Certificate and Distribution Profile.
2. I would click "Show in Finder" on the .app file produced and drag the .app file into iTunes
3. iTunes would process the .app into a .ipa which I could then select the app icon in iTunes, "Show in Finder" and copy to give to the client for distribution through his MDM system.
The new iTunes 12.7 does not show apps so this method does not seem possible any more. Is there another way to convert the .app to a .ipa file?