Article Here:
http://www.vrfocus.com/2017/03/free-multiplayer-map-coming-to-arizona-sunshine-next-week/

If you are having trouble creating a lobby or being invited to a lobby I highly suggest that you take these 3 steps before trying again.

1. Make sure Arizona Sunshine is not being blocked by Windows Firewall.

2. Open port 48170 in your routers port forwarding section.

3. If your antivirus has built-in firewall functionality, either disable that feature or disable your antivirus temporarily.