[2022] PC & MAC Multiplayer Issues

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DylMan62 said: have both force enabled crossplay with the "-nakama" launch option

If you are both on Steam you do not need to do this. But if you do want to try that, use the droplist next to PLAY in our launcher to choose Cross store MP.

There was an update last night that fixed some MP issues. I suggest you both delete your Documents/Paradox Interactive/Stellaris/cache folder, then try a new galaxy under that patch.