You can’t share passkeys yet. But we’re working on adding this feature. For the time being, many websites and apps support both passkeys and passwords, so you can share a password if you want someone else to access your account.
You can move passkeys between Dashlane and Apple Passwords, 1Password, Bitwarden, or any other third-party iOS app that supports Credential Exchange. Credential Exchange is available on devices running Android 10 or later and updated to the latest version of Google Play Services.
The Credential Exchange feature is part of a broader industry push for open standards, giving you more control and flexibility. Dashlane and other companies are working to make it possible to import and export passkeys between password managers as well.
More about Credential Exchange
You can't export passkeys using CSV files or back them up with DASH files.