Cataclysm asking me to Authenticate every time

Hi,
Every time i start Cataclysm Classic (even from Launcher) I am asked to enter an Authenticator Code, after that I also have to select my WoW-Account again (WoW2 EU in my case). This did not happen during the WotLK version of the game and does also not happen when I launch Classic Era or even Retail.

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