Like 99% of the time it’s because either something is setup wrong or an resoruce somehow fucks it up. Atleast what i know
Mostly because something is not setup quite right
So how’s it going? Is it going forward?
I’ve just checked on a website and it looks like you have it configured correctly…
Try direct connecting. Usually (if no players join the server) it takes a maximum of five minutes before it’s shown on the server list. This doesn’t mean the server isn’t working just, it’s not on the server list yet.
For anyone else having this issue: Double check your inbound and outbound rules. FiveM needs both allowed through the firewall for it to work.
Fixed by adding the EXE to the outbound rules and allowing connection.
Pretty sure heartbeats let the server list know your server is alive. Your server should appear online after sending 2 heartbeats (heartbeats are sent every 4 minutes, or whenever a player joins), granted you have everything else setup correctly of course 
Edit: This was the info one of the elements provided a few days ago (talking about the serverlist):
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