Create session failed.

I’m doing it in the editor, not even a packed game, what could cause it ?

Every time i click the button that creates the session i get this in the log:
Capture.JPG

This is the blueprint:

I’ve tried it with “Using lan” on and off.

Ok add this into the DefaultEngine.ini file has solved it, even though i think it should just work without any kind of tweaking for better user UX:

[OnlineSubsystem]
DefaultPlatformService=Null

Also, if you have a code project and want it to work when packing the game, you have to add this one too in the *.build.cs file :