So until then you have to do what parent said? Change each one individually when you switch devices? Thanks but no.

I keep all my Passkeys in Bitwarden, it works fine across different devices and I use all major platforms regularly (iOS, Android, Windows, MacOS, ChromeOS). As a backup I've also added some extra duplicate Passkeys in the Chrome and iCloud password manager for the most important accounts in case I lose access to Bitwarden somehow.