You can’t share passkeys yet, but this feature is in development. 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, Google Password Manager on Android, or any other third-party app that supports Credential Exchange.
Credential Exchange is part of a broader industry push for open standards. You can switch password managers anytime without data loss.
More about Credential Exchange
You can't export passkeys using CSV files or back them up with DASH files.