Lordi, please follow these instructions:

1. Make sure you are not running ANY other mods, except those specifically certified for STNH. Yes, even mods used to work with STNH.
2. Make sure you do not have ANY custom empires enabled. Log to vanilla and make sure you have none still active.
3. Make sure you run Stellaris version 1.6* and not 1.7*.
4. Make sure you start a new game. The Beta update is not backward compatible.
5. If 1-4 do not help, try disabling your SLI protocols and updating your graphics drivers.
6. If 1-5 do not help, unsubscribe from the mod and any other mod, uninstall stellaris, manually remove all folders related to it, and do a complete, clean reinstall.
7. If 1-6 do not help, please submit a full detail bug report, a save file and an error log on our public discord bug report channel.

Same issue here, a friend of mine and I just installed the game and mod today and we cant connect in mp, the steps did not help, we have version 1.6.2 d7ec. Do you have any other suggestions?

nates im the same we cant seem to work out why

Same here