Swift/Xcode/tvOS/Crash log

I cannot believe this is rocket science… I have a Swift/tvOS app being testing in TESTFLIGHT
the user has crashed it, but neither of us can figure out how to get the crash-log. (Note: so far the crash is not reproducble, its happens randomly)

So web articles indicate you have to compile a special version of the app with another SDK
most articles say TF does it automatically…

Doe anyone “know”?