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Specifies a url parameter name which will be used on the SAML IdP login page to autofill the username field.
User's email assosiated with their Google ChromeOS profile will be used as a value for the url parameter. So this setting should be disabled if users are expected to use different emails with SAML IdP.
If this setting is unset, users will need to manually enter their username on the SAML IdP login page.
This policy affects online authentication on sign-in and lock screens.