If the caps are wrong or char length is incorrect or you gave it an non active key it is going to fail. If it says incorrect key that means your key fail to sign the message. Make sure your key is WIF.
Edit: Also, it is now confirm by multiple people that it is working properly, so we should be stable.
My mistake. i was trying to use the wrong key. What I failed to do is log in to the account> go to settings>view Keys>(click the key icon)>private key viewer> show. This will show the private key in WIF wallet import Format. It should begin with a "5".
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