3829538 - Error: "checksum mismatch at 0 of 20"

I received an encrypted file from Concur's SFTP and my application is unable to decrypt it. When I try to open/decrypt the file, I get an error that says something like "checksum mismatch at 0 of 20."

Why a PGP/OpenPGP decryption tool reports a "checksum mismatch" error when opening an encrypted file — including the most common real-world cause: a failed signature check that the client's tool mislabels as a checksum error. , KBA , CON-CA-TLS-IEM , Import / Extract Monitor , Problem