cannot log in at all

I've reinstalled league for the first time in a few months, at the place where I'm staying, the internet is private but in the settings, the security says open. I've installed/reinstalled about 10 times, twice today. I have tried several solutions but none work. It's just stuck at the "Authenticating" stage, and it goes on like forever until sometimes an error saying "Unexpected login issue" appears. Any way I can fix this?

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