Hmm...we can't find this setting yet, but we'll keep checking. Feel free to contact us for help.
Looks like you're signed in with a Gmail account. Please try again with your account that you use to access Google Admin.
Setting the policy to Enabled allows third-party images on a page to show an authentication prompt.
Setting the policy to Disabled or leaving it unset renders third-party images unable to show an authentication prompt.
Typically, this policy is Disabled as a phishing defense.