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Passwords have problems, but passkeys have more
(world.hey.com)
This is a most excellent place for technology news and articles.
Either you enroll a system that shares them between devices without the need for special interaction (password manager, iCloud etc) or you enroll each device separately into your account.
You can have more than one passkey for a service. This is a good thing.
Gotcha, that makes more sense when explained that way!