[Steam Multiplayer] People outside of my router can't host games

As the title implies, I have an issue with my packaged project. Whenever I or anyone connected to my router host a game, everyone that is connected to steam can see & join the server. But noone else so far was able to host a game that was visible in my Server list.

I have the same issue, did you find a solution?

The issue was gone when I updated my project to 4.25