My Five M server does not show up on the list anymore, I have not changed anything and it happened after Five M developers said that the INVALID KEY stuff was fixed anyone have any ideas? Or maybe the Five M staff themselfs?
Take a look at this tutorial: [EXPLAINED] How to make/add a server key
By the way, next time post these kind of server related questions in the #server-development:server-discussion category please 
If you’ve already done what @Vespura said and you’re still having issues then see this post: