Riot Games has implemented multi-factor authentication (MFA) for accounts it detects as being shared in VALORANT Competitive queue, alongside a round of quality-of-life changes to interactive objects and a long list of map and Agent fixes.
The update arrived on October 28th with Patch 11.09, as detailed by Ashley ‘Ash’ Tsao, Global Community Manager at Riot Games.
From Patch 11.09, accounts detected for sharing in North America, Latin America, Brazil and Korea must enable Riot Mobile MFA to play ranked; other modes are unaffected. Riot also reiterated that reports for smurfing should be filed under Rank Manipulation.