Update provision-users-enterprise.mdx

Update for Add Ec via API

Author: clairekinde11

src/content/docs/authenticate/enterprise-connections/provision-users-enterprise.mdx

@@ -49,7 +49,9 @@ It’s possible that you manage users who can sign in via multiple enterprise co
 
 This method of provisioning requires you to add the enterprise connection as part of the user’s identity in Kinde.
 
-**Add the enterprise connection identity via API (coming soon)**
+**Add the enterprise connection identity via API**
+
+Post identity details to this endpoint `POST /api/v1/users/{user_id}/identities` with `enterprise` as the type and the `connection_id`. For more information, see [Create identity](https://docs.kinde.com/kinde-apis/management/#tag/users/post/api/v1/users/{user_id}/identities).
 
 **Add the enterprise connection identity manually**