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UWP Epic Fail

Hi there all!
this is my situation at the moment:
I’m able to package any project for UWP (UE4 source code 4.19 branch) with 0 errors 0 warnings but then when launching the app on Win 10 it crashes on startup.
In the video below as you can see I’m testing with the First Person template.
what am I doing wrong?

https://www.youtube.com/watch?v=5l4Xkz9U6GA