How to debug crash that only happens in shipping build?

Hi,
I’m having a Multiplayer crash, in which the client gets a fatal crash when servertravel is called from the server.
My problem is that this does not occur in standalone builds or build for development, so I’ve become a bit clueless on how to approach this problem, since there is no log files to help and debugging minidump files seems to be Unsupported.

I did find a post on how to enable Logging in shipping builds, but after following instructions i still havn’t been able to generate logs.

How do you guys approach these problems?

Note: We don’t build the engine code ourselves but download it from the launcher.