The account has been blocked

I am a World of Warcraft nostalgic server player in the Asian server.December 5th,My World of Warcraft nostalgia service account has been blocked for some reason,I don’t know why.
Previously, I played a copy upgrade with some friends,I’m not a robot.My character is a priest,I called the group members to make copies on the World Channel,Yesterday, the group was full and was going to make copies, but it was stopped unexpectedly,Will this also be sealed? Please check it carefully and help to unseal it. Thank you very much
Can you tell me who I should contact to appeal?

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