TIP: if the game doesn't connect during champ select. Hit cancel Not Retry. : r/leagueoflegends
Fix Failed to Log in Problems & Connecting to network Connection in Marvel Contests of Champions - YouTube
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PSA] For the people unable to connect after champ select and that don't get a reconnect button after going back to homescreen. This is a bug, Riot is currently looking for accounts
Champions Recovery Room and Physical Therapy LLC | Urbandale IA