BD-3906, BD-3839: Clarify email identifier and prioritization value

_docs/_api/endpoints/messaging/send_messages/post_send_triggered_campaigns.md

@@ -77,7 +77,7 @@ Authorization: Bearer YOUR-REST-API-KEY
 |`trigger_properties`| Optional | Object | See [trigger properties]({{site.baseurl}}/api/objects_filters/trigger_properties_object/). Personalization key-value pairs that will apply to all users in this request. |
 |`broadcast`| Optional | Boolean | You must set `broadcast` to true when sending a message to an entire segment that a campaign or Canvas targets. This parameter defaults to false (as of August 31, 2017). <br><br> If `broadcast` is set to true, a `recipients` list cannot be included. However, use caution when setting `broadcast: true`, as unintentionally setting this flag may cause you to send your message to a larger than expected audience. |
 |`audience`| Optional | Connected audience object| See [connected audience]({{site.baseurl}}/api/objects_filters/connected_audience/). |
-|`recipients`| Optional | Array | See [recipients object]({{site.baseurl}}/api/objects_filters/recipient_object/).<br><br>If `send_to_existing_only` is `false`, an attribute object must be included.<br><br>If `recipients` is not provided and `broadcast` is set to true, the message will be sent to the entire segment targeted by the campaign. |
+|`recipients`| Optional | Array | See [recipients object]({{site.baseurl}}/api/objects_filters/recipient_object/).<br><br>If `send_to_existing_only` is `false`, an attribute object must be included.<br><br>If `recipients` is not provided and `broadcast` is set to true, the message will be sent to the entire segment targeted by the campaign. <br><br> If `email` is the identifier, you must include [`prioritization`]({{site.baseurl}}/api/endpoints/user_data/post_user_identify#identifying-users-by-email) in the recipients object. |
 |`attachments`| Optional | Array | If `broadcast` is set to true, then the `attachments` list cannot be included. |
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_docs/_api/endpoints/messaging/send_messages/post_send_triggered_canvases.md

@@ -67,7 +67,7 @@ Authorization: Bearer YOUR-REST-API-KEY
 |`canvas_entry_properties`| Optional | Object | See [Canvas entry properties]({{site.baseurl}}/api/objects_filters/canvas_entry_properties_object/). Personalization key-value pairs will apply to all users in this request. The Canvas entry properties object has a maximum size limit of 50 KB. |
 |`broadcast`| Optional | Boolean | You must set `broadcast` to true when sending a message to an entire segment that a campaign or Canvas targets. This parameter defaults to false (as of August 31, 2017). <br><br> If `broadcast` is set to true, a `recipients` list cannot be included. However, use caution when setting `broadcast: true`, as unintentionally setting this flag may cause you to send your message to a larger-than-expected audience. |
 |`audience`| Optional| Connected audience object | See [Connected audience]({{site.baseurl}}/api/objects_filters/connected_audience/). |
-|`recipients`| Optional | Array | See [Recipients object]({{site.baseurl}}/api/objects_filters/recipient_object/). If not provided and `broadcast` is set to true, the message will be sent to the entire segment targeted by the Canvas.<br><br> The `recipients` array may contain up to 50 objects, with each object containing a single `external_user_id` string and a `canvas_entry_properties` object. Either `external_user_id` or `user_alias` is required for this call. Requests must specify only one. <br><br> When `send_to_existing_only` is `true`, Braze will only send the message to existing users—however, this flag can't be used with user aliases. When `send_to_existing_only` is `false` and a user with the given `id` does not exist, Braze will create a user with that ID and attributes before sending the message.|
+|`recipients`| Optional | Array | See [Recipients object]({{site.baseurl}}/api/objects_filters/recipient_object/). If not provided and `broadcast` is set to true, the message will be sent to the entire segment targeted by the Canvas.<br><br> The `recipients` array may contain up to 50 objects, with each object containing a single `external_user_id` string and a `canvas_entry_properties` object. This call requires an `external_user_id`, `user_alias`, or `email`. Requests must specify only one. <br><br> When `send_to_existing_only` is `true`, Braze will only send the message to existing users—however, this flag can't be used with user aliases. When `send_to_existing_only` is `false` and a user with the given `id` does not exist, Braze will create a user with that ID and attributes before sending the message. <br><br> If `email` is the identifier, you must include [`prioritization`]({{site.baseurl}}/api/endpoints/user_data/post_user_identify#identifying-users-by-email) in the recipients object. |
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