Added note to beta topic.

Author: Lauragra

api-reference/beta/resources/call.md

@@ -28,7 +28,10 @@ Becomes:
 ```http
 https://teams.microsoft.com/l/meetup-join/19:meeting_NTg0NmQ3NTctZDVkZC00YzRhLThmNmEtOGQ3M2E0ODdmZDZk@thread.v2/0?context={"Tid":"72f988bf-86f1-41af-91ab-2d7cd011db47","Oid":"4b444206-207c-42f8-92a6-e332b41c88a2"}
 ```
-
+> [!NOTE]
+> The following known issues are associated with this resource:
+> - [Webhook message processing exception: System.Security.Cryptography.CryptographicException](https://developer.microsoft.com/en-us/graph/known-issues/?search=24752)
+> - [Support for multi-endpoint use case in delta roster notification mode is missing](https://developer.microsoft.com/en-us/graph/known-issues/?search=24894)
 
 ## Methods