I know this affects more people than spanish players, but since it can be a regional issue I can confirm that no spanish player I know is able to see anyone in the multiplayer lobby.
We can play quick battles just fine though, but we cannot see the ranking, it also appears empty. We can also invite players to a multiplayer match we created and it works just fine.
The issue affects as well multiplayer campaigns' lobby.
This is the exact problem we are experiencing: https://forums.totalwar.com/discussion/242688/bug-empty-list-of-servers-in-multiplayer-from-main-menu#latest
I believe it is important to solve this asap, since multiplayer is a key aspect of the game.
Biggest Spanish total war youtube Channel