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I'm using Mac High Sierra. How do I reset my key chain? I went in to the "Keychain Access" application, clicked on the "Reset My Default Key Chains" button and then entered my login password, but get the message

Unable to obtain authorization for this operation.

What do I need to do to reset my keychain? I know I'm entering the right password because when I enter the same one in a termiainl using "sudo" it accepts it.

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