Cannot login at game start

I created a novel telltale account after I bought GoT over amazon and could successfully redeem the code. I downloaded and installed the game. After starting it, he asks for my telltale credentials again. But when I enter my account name and password, he says that login was not successful and that I have to sign out and try again or to exit the game. I verified multiple time that the password is correct (direct copy from Microsoft Edge's and Internet Explorer's Password manager) but no success. If I click on "forgot password" or "verify email adress" on the telltale account settings, no email is send at all (also not into spam folder of gmx). Any hints for me?

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