So far as I can convey to, copyright and Jaxx no more guidance BIP39 passphrases. The user interfaces do not give the consumer any suggests to enter just one whilst restoring wallet. Nonetheless, I have not been in a position to verify this with guidance from possibly wallet maker. BIP39 https://thejillist.com/story9027951/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-definition