Bip39 mnemonic phrase tool https://telegra.ph/Producing-Custom-Bitcoin-Addresses-A-Take-A-Look-At-BIP39-Strategies-06-28 As a consequence of how the BIP39 standard works it is not ample in some cases to write down simply a seed phrase. It's also important what derivation route you were being employing. In some cases when importing a seed phrase to a unique wallet https://royalbookmarking.com/story19834491/bip39-generator-bip39-npm-no-further-a-mystery-https-cutt-ly-uryc5rw7