Can't find steam sessions ingame (advanced sessions)

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Hello,

i got the server showing up in the Steam Server-Browser. But the Server is not visible for the game’s own browser.

I using the 480 AppID at the moment.

I use this start command: Server.exe /Game/Maps/TestMap -log ?Port=7100?QueryPort=25500

The server is running on a Remote-Machine which is located in a data center and all ports are open. Without steam, (-nosteam parameter) I’m able to join the server via open :

I got the overflow message
The Server appears in Steam (as Spaceware Server), with the correct settings

I start the Session in the Gameinstance, see screenshot

306144-gameinstance.png
306144-gameinstance.png1499×663 206 KB

I search the sessions like this:

306145-findsessions.png

I find other servers but not my own.

So I have no idea whats wrong, did I missed something?

Im Using UE 4.25.1