-> When you send data to Klaviyo using `analytics.js`, an initial `page` call is required. By default, this is already added in your [Segment snippet](/docs/connections/sources/catalog/libraries/website/javascript/quickstart/#step-2-copy-the-segment-snippet). In addition to the `page` call, `identify` must be called on each subdomain where you want to track users. Klaviyo sets cookies on the subdomain rather than the top level domain, making this extra `identify` call necessary for tracking.
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