Spinach Error During Tutorial Despite Stable Connection and Following Network Troubleshooting Guides (Steam)

Hello,

I'm experiencing an issue with Marathon. Shortly after starting the tutorial, I consistently get the Spinach error and am disconnected from the game.

What's strange is that I don't have any connection problems with other games. I can play Destiny 2 without any issues, and every other online game I own works normally as well.

I've already followed the network troubleshooting guides provided by Bungie, including the recommended connection and port-forwarding steps, but unfortunately none of them resolved the problem.

Thank you.