If you're on pc I've found their riot app in the system tray when it won't boot. Double click it or kill it and see if that fixes it
Nah, android. It takes 2 hours to reinstall so I'd rather not but I'm willing to try it.
You could try clearing cache or data in apps. If it worked before, that'd be a good place to start. Then if those don't work reinstall.
Still working on Android/GrapheneOS, for what it's worth.
What android version are you running?
It's working on GrapheneOS 2024032100 aka Android 14, as well as my old Samsung tablet on Android 11.
Set in the League of Legends universe, Legends of Runeterra is the strategy card game created by Riot Games where skill, creativity, and cleverness determine your success.