A couple of years ago, Riot Games decided to remove the ability for high-ranked League of Legends players to queue together for the sake of fairness and matchmaking speed. This year, however, they might be reversing the decision and bringing duo queue back.
During an AMA on the League subreddit, design director August “Iksar” Dean Ayala confirmed that the developers were considering opening up duo queue for players in Masters rank, along with players in in Diamond and below. There was, however, some hold up on the decision due to differentiating stances from varying regions around the world.