This Wednesday (27/03), the LoL servers left the ar. For now, the reports were made by players on the servers Brazil e LATAM.
Riot Games claims to be working on the issue
According to the message in the client in the image above, Riot has already understood that there is a problem and is working on a solution to the login problem.
There is still no preview of when the problem will be resolved, but with any news about what happened, the More Esports will bring an update to this article.
Source: https://maisesports.com.br/lol-servidores-estao-fora-do-ar-riot-confirma-estar-buscando-solucao