Bip39 Ian Coleman. The passphrase is just not picked with the predefined list of 2048 words – it might be any word or phrase you choose. Sure, BIP39 passphrases are situation-sensitive. Make sure you enter your passphrase exactly while you set it up, which include any uppercase or lowercase letters. https://social4geek.com/story4383089/bip39-list-https-linktr-ee-bip39-top-guidelines-of-bip39-words