Update index.md

Author: courtneyga

src/connections/destinations/catalog/actions-google-enhanced-conversions/index.md

@@ -127,3 +127,7 @@ This error indicates that the conversion action specified in the upload request
 
 To resolve this, ensure that the ConversionActionType value in Google Ads is correctly configured.
 
+### Conversion Upload Error 
+
+Due to Google's requirement to use only one click ID to update a conversion. Essentially, only one identifier (GCLID, GBRAID, or WBRAID) should be used per ClickConversion entry, and including more than one in a single entry will result in an error.
+