The second, less common case is that Engage re-syncs an audience or computed trait when a new `external_id` is added to a profile. For example, an ecommerce company has an anonymous visitor with a computed trait called `last_viewed_category = 'Shoes'`. That visitor then creates an account and an email address is added to that profile, even though the computed trait value hasn't changed. When that email address is added to the profile, Engage re-syncs the computed trait that includes an email to downstream tools. This allows the ecommerce company to start personalizing the user's experience from a more complete profile.
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