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2 changes: 2 additions & 0 deletions src/connections/destinations/catalog/klaviyo/index.md
Original file line number Diff line number Diff line change
Expand Up @@ -85,6 +85,8 @@ If your `userId` is an email, or you provide an email in `traits.email`, Segment
#### Enforce email as primary identifier

This option is enabled by default to ensure duplicate profiles are not being created inside of Klaviyo. When enabled, Segment will never set the $id field to your `userId` when you call `.identify()` or `.track()`. Instead, Segment will only set $email as the primary identifier with your `traits.email` or `properties.email`. Please note that if you have this setting toggled on, you must send `email` in on your payloads or your events will not go through to Klaviyo.
> info ""
> For the Web Device-mode connection, this option applies **only** to the `.identify()` call.

#### Fallback on Anonymous ID

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