Soldier front 2 aria link

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So I know you have to link an Aria account to play, however, when I started the game for THE FIRST TIME on this account, it seemed to log in automatically, and didn't tell me to link an account. Now whenever I log in, it says "Success!" And I log in, how do I figure out what Aria account i'm linked to?

[とげ]

Please help. I'd like to know ASAP