https://support.google.com/chrome/answer/13168025?hl=en-GB&co=GENIE.Platform%3DAndroid&oco=1
Manage passkeys in Chrome - Android phone and tablet - Google Chrome Help
Passkeys are a simple and secure way to sign in to both your Google Account and the sites and apps that you care about – without a password. To improve your...
manage passkeysandroid phonegoogle helpchrometablet
https://support.apple.com/en-mo/guide/personal-safety/ips3ce9f6e15/web
Manage shared password and passkeys - Apple Support (MO)
On your iPhone, iPad, and Mac, you can create or join a group of trusted contacts to share passwords and passkeys across devices.
apple supportmanagesharedpasswordpasskeys