To delete a security key, you need to access the settings where the passkeys are managed. If you are using Windows 11, version 22H2 or later, you can follow these steps:
- Open the Settings app.
- Navigate to Accounts > Passkeys.
- You will see a list of saved passkeys. Find the one you want to delete.
- Select ... > Delete passkey next to the passkey name.
Please note that some passkeys associated with login.microsoft.com cannot be deleted, as they are used with Microsoft Entra ID or Microsoft Account for signing in to the device and Microsoft services.
If you are using an Authenticator app on Android or iOS, you can delete the passkey by tapping the account name, going to Settings, and then selecting Delete passkey. Make sure to also check your Security info to ensure it is removed from there as well.