If your friend has a server, and you can’t get it to show up on your list. This guide might be able to help you. Also, it is a bit finicky, so this may or may not work for you.
– Open steam window
– Go to view and then down to servers
– Go to add server
– Type in the IP and the port, add the server
– Refresh and QUICKLY right click on the server
– IF you can join game do it
– you may have to try refresh a few times.
– You may also need to check the IP address and port number
– try adjusting the port up or down one
– Enter any passwords that are needed and you should be good