Got zerotier? Hamachi? or some other LAN client/VPN on your pc? Yeah, check if that's open, close it and try to launch the game. Still didn't work? Close in task manager (or delete) zerotier, or your equivalent LAN thing and try again. Still doesn't work? If you have a VPN turn it off and attempt to load in. At this point if you think it is still a specific program and it isn't letting you in. Then YOU need to remember what programs you've got sadly. Another thing you can do (in win 11) is hover your mouse over your network icon in your taskbar. It will show you the current connections your computer is on. This can help identify what you need to disconnect from. No luck yet? Then it's something else covered in another guide involving "require data" which I didn't have to do personally.