I cannot install *.ipa file to my iPhone via Xcode / Devices. I get message: “App” does not contain an application bundle, so it cannot be installed on iPhone 5.
But *.app file I can install to my phone via XCode / Devices!
I just verified, this seems to be the old DEF-1672 which @britzl referred to. We’re looking into it.
In the meantime, perhaps you can use the .app folder for installing?