Randomly received summoner Icon from Rito

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Hiya! I just opened my cliënt to check if Elementalist Lux was out yet (spoiler alert: it's not), and randomly received two summoner icons. The first one was the teemoing icon, which I already had but only now got the notification for some reason (???), and the other one (marked on the image) I have no clue what I received that for. Can anyone explain what it's for? I'd like to know. Thanks!
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