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Passkeys Explained: The End of Passwords
(sentientrant.com)
This is a most excellent place for technology news and articles.
Bitwarden does support access to access keys in (for example) firefox.
I have not tested outside of browser (firefox). So it may depend on if you use chrome or some other app.
Edit: Just got a suggestion inside the Amazon app (Android. Yes, I hate Amazon as well but I got a gift card and I hate it even more to give them a free of charge credit) to add a passkey. So it seems to work (semi-)reliable outside of a browser.