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Controlling access to objects
I believe there's a problem with this challenge if you have Person Accounts enabled in the org that you're using with Trailhead. With Person accounts enabled, Contacts under Org-Wide Defaults are set to "Controlled by Parent" and can't be changed, which therefore means when you create a profile with Read access to the Accounts object, you must also give Read access to the Contacts object. There's no way to specify access to just the Accounts object, which is required to pass this Challenge. Am I missing something?