If your device is not visible on the Microsoft Account page, re-sign in and refresh the page. If that doesn't work, follow ...
Morning Overview on MSN
How to sync passkeys in Chrome across Android, iPhone, Mac, PC
Passkeys are finally mature enough that you can sign in to most major services with your face, fingerprint, or device PIN ...
For X (Twitter), just go to Settings and Support > Settings and Privacy. Then select Security and account access > Security.
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