Update invitation-post.md

Author: FaithOmbongi

api-reference/beta/api/invitation-post.md

@@ -3,7 +3,7 @@ title: "Create invitation"
 description: "Create a new invitation or reset the redemption status for a guest user. The invitation adds an external user to the organization."
 ms.localizationpriority: medium
 author: "ppolkadots"
-ms.subservice: "entra-sign-in"
+ms.subservice: "entra-users"
 doc_type: apiPageType
 ms.date: 10/17/2024
 ---