I am sure it's not user mistake, since the recovery phrase was present in two distinctive areas: backed up in the file on S3, and printed over a bit of paper. This information describes BIP39, the standard that defines how seed phrases are made, and summarizes how BIP32 and BIP44 https://bookmarkcitizen.com/story18817226/considerations-to-know-about-bip39-word-list-pdf