3817672 - Error: "Decryption failed: No secret key"

I'm trying to decrypt an extract file and keep receiving the message "Decryption failed: No secret key". What can I do to solve this?

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I need to be able to decrypt extract files. , KBA , CON-CA-TLS-IEM , Import / Extract Monitor , CON-CA-TLS-IEM-JOB , Scheduled Jobs , Problem

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