I can't log into my cloud account (free tier)

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I can't log into my cloud account (free tier). Always the same message: Invalid username or password. If I try to change the password I don't receive an email. I contacted an agent, I get the password reset email, I manage to reset it and with the second email that sends the link with the reset password confirmation I get the message: { "code" : "NotAuthorizedOrNotFound", "message" : "Authorization failed or requested resource not found." }

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