I changed region now I can't sign in help please!

Ok so I moved to korea with my NA account and since you cant change your region to Korea I bought the japan region change, and upon doing so it reset the client but now it keeps telling me my user or password are incorrect when I know for a fact their not. Any idea on how I can sign back in ?
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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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