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Passkeys Explained: The End of Passwords
(sentientrant.com)
This is a most excellent place for technology news and articles.
All I know is a few months back someone setup a passkey on a shared google account at my job and now nobody but knows what the password for our email is. I can use the passkey to sign in with my phone, but only I can do that.
I think Google accounts are made usually for single user and thus passkeys. But may be you can try going to the share Google accounts security and there's an option skip password when possible. Disable it... May be it might work. I'm not sure tough.
If you can sign in, you should be able to reset the password.