You will need one user who is the Admin and will run the Local game, and all Users will connect to the Admin's network. Instructions for each user - Admin and User - are below.
- Download and run ZeroTier on your machine
- Sign in to the web client (my.zerotier.com/network)
- Ensure it's set to private so rando's don't join
- Share the Network ID with all your users, and when they join click the checkbox in the in the "Auth?" Column
- Optionally give them an IP address that you want them to have
- You will need to install and run this to make it work every time you reconnect to ZeroTier: https://github.com/dechamps/WinIPBroadcast/releases/tag/winipbroadcast-1.6
- Download Zero Tier for your platform (https://www.zerotier.com/download/)
- Get a Network ID from the host, and join it from your Zero Tier client
- You may need to check the Default Route or Global checkboxes depending on your platform/config
- Tell the host you've sent a request and have them approve it
- Open up Among Us and select "Local" rather than "Online", join the server that is on the host machine
still works?