Merge pull request #6792 from segmentio/joeynmq-patch-2

Update index.md

Author: forstisabella

src/connections/destinations/catalog/actions-klaviyo/index.md

@@ -84,9 +84,16 @@ To add and remove profiles in Klaviyo with Engage Audience data:
 
 ## FAQ
 
-### Dealing with 429 Responses from Klaviyo's API
+### Dealing with Error Responses from Klaviyo's API
+ 
+#### 429 Too Many Requests
 
-If you're encountering rate limiting issues, consider enabling batching for the Action receiving these errors. Ensure that within the mapping configuration, "Batch data to Klaviyo" is set to "Yes". This adjustment can help alleviate the rate limiting problem.
+If you're encountering rate limiting issues, consider enabling batching for the Action receiving these errors. To enable mapping, navigate to the mapping configuration and set "Batch data to Klaviyo" to "Yes". This adjustment might help alleviate the rate limiting problem.
+
+#### 409 Conflict
+In most cases, you can safely ignore a `409` error code. 
+
+When you use the [Upsert Profile](/docs/connections/destinations/catalog/actions-klaviyo/#upsert-profile) mapping to send Identify events, Segment first attempts to [create a new profile in Klaviyo](https://developers.klaviyo.com/en/reference/create_profile){:target="_blank”}. If the first request returns with a `409` error code, Segment sends a second request to [update the existing profile with the given profile ID](https://developers.klaviyo.com/en/reference/update_profile){:target="_blank”}. 
 
 ### Can I send Engage Audiences to a pre-created Klaviyo List?