[Openurmind]

Please see See #38. It is an encrypted key code you have to keep and store on a second device like a USB key device or phone.

[Svartalfiar]

So a passkey is just a really long password that no one can remember so you have to copy-paste it from a text file instead, and can therefore only login from one device, unless you’re emailing or texting this really long password to yourself on another device.