Still no clues how to get this working. Did anyone figure it out?

Hi aotondo, we are experiencing the same issue as you described in our app. Did you find any fixes or workarounds? Thanks.

I'm sorry, I accidentally marked your answer as a solution. It did help me but it isn't the best solution. After hours of investigating I created Ad-Hoc profile for every target and changed the method from automatic to manual when exporting the app. @KMT I didn't say it was during the build, the problem was that when exporting the app as Ad-Hoc I don't see the window with 2 radio buttons where I can select between "Automatically manage signing" and "Manually manage signing". At the end I filed a radar: FB8726812 (Xcode not asking for "Automatically manage signing" on app export). Thanks for your help!