Unable to join chat (euw)

Its 3rd day that this is happening for some reason whenever i login in league it says unable to join chat and because of this i can't talk in champ select and cant play with friends. I found temporary solution to use vpn that it would change my ip and then chat is working all fine. So what could be a problem and how to fix it?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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