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The secret key for 2FA should be 16 characters long (letters and numbers).
You also mentioned Samourai wallet. Do you have your 12-word seed for that wallet? If you do, you can import it to another Bitcoin wallet like Electrum and then sign a message for the bitcoin address used for deposit on freebitco.in.
but, if the Quin not request to sign message, who will see it? and all tryies to reset password, arrive expitred...why sign message for? its not automatic....needed an answer from support that dont answer.