For a period of this morning a setting called restricted mode 2 was active, sometimes this mode is activated when there is either a small amount of staff able to moderate the server or a wave of new players with bad intentions has come into the city. During this mode People who are whitelisted (Players who have a good track record and thus have been granted extra perms) and players have some sort of gold supporter are the only people guaranteed entry into the server queue, By now that mode should have been turned off so if you restart both steam and fiveM you should have better luck now.