Added a note to indicate Rooms support CommunicationUserIdentity only

Author: mikehang-msft

articles/communication-services/quickstarts/rooms/get-started-rooms.md

@@ -27,7 +27,7 @@ The following table lists the main properties of `room` objects:
 | `validFrom`           | Earliest time a `room` can be used. |
 | `validUntil`          | Latest time a `room` can be used. |
 | `pstnDialOutEnabled`  | Enable or disable dialing out to a PSTN number in a room.|
-| `participants`        | List of participants to a `room`. Specified as a `CommunicationIdentifier`. |
+| `participants`        | List of participants to a `room`. Specified as a `CommunicationUserIdentifier`. |
 | `roleType`            | The role of a room participant. Can be either `Presenter`, `Attendee`, or `Consumer`. |
 
 ::: zone pivot="platform-azcli"

articles/communication-services/quickstarts/rooms/includes/rooms-quickstart-java.md

@@ -123,7 +123,7 @@ RoomsClient roomsClient = new RoomsClientBuilder().connectionString(connectionSt
 ## Create a room
 
 ### Set up room participants
-In order to set up who can join a room, you need to have the list of the identities of those users. You can follow the instructions [here](../../identity/access-tokens.md?pivots=programming-language-java) for creating users and issuing access tokens. Alternatively, if you want to create the users on demand, you can create them using the `CommunicationIdentityClient`.
+In order to set up who can join a room, you need to have the list of the identities of those users. You can follow the instructions [here](../../identity/access-tokens.md?pivots=programming-language-java) for creating users and issuing access tokens. Alternatively, if you want to create the users on demand, you can create them using the `CommunicationIdentityClient`. ACS Rooms currently supports a room participant of type CommunicationUserIdentifier only, using other types of CommunicationIdentity will result in a runtime error.
 
 To use `CommunicationIdentityClient`, add the following package:
 

articles/communication-services/quickstarts/rooms/includes/rooms-quickstart-javascript.md

@@ -89,7 +89,7 @@ const roomsClient = new RoomsClient(connectionString);
 
 ### Set up room participants
 
-In order to set up who can join a room, you need to have the list of the identities of those users. You can follow the instructions [here](../../identity/access-tokens.md?pivots=programming-language-javascript) for creating users and issuing access tokens. Alternatively, if you want to create the users on demand, you can create them using the `CommunicationIdentityClient`.
+In order to set up who can join a room, you need to have the list of the identities of those users. You can follow the instructions [here](../../identity/access-tokens.md?pivots=programming-language-javascript) for creating users and issuing access tokens. Alternatively, if you want to create the users on demand, you can create them using the `CommunicationIdentityClient`. ACS Rooms currently supports a room participant of type CommunicationUserIdentifier only, using other types of CommunicationIdentity will result in a runtime error.
 
 To use the CommunicationIdentityClient, install the following npm package:
 

articles/communication-services/quickstarts/rooms/includes/rooms-quickstart-net.md

@@ -91,7 +91,7 @@ RoomsClient roomsClient = new RoomsClient(connectionString);
 
 ### Set up room participants
 
-In order to set up who can join a room, you'll need to have the list of the identities of those users. You can follow the instructions [here](../../identity/access-tokens.md?pivots=programming-language-csharp) for creating users and issuing access tokens. Alternatively, if you want to create the users on demand, you can create them using the `CommunicationIdentityClient`.
+In order to set up who can join a room, you'll need to have the list of the identities of those users. You can follow the instructions [here](../../identity/access-tokens.md?pivots=programming-language-csharp) for creating users and issuing access tokens. Alternatively, if you want to create the users on demand, you can create them using the `CommunicationIdentityClient`. ACS Rooms currently supports a room participant of type CommunicationUserIdentifier only, using other types of CommunicationIdentity will result in a runtime error.
 
 To use the `CommunicationIdentityClient`, install the following package:
 

articles/communication-services/quickstarts/rooms/includes/rooms-quickstart-python.md

@@ -79,7 +79,7 @@ rooms_client = RoomsClient.from_connection_string(connection_string)
 ## Create a room
 
 ### Set up room participants
-In order to set up who can join a room, you'll need to have the list of the identities of those users. You can follow the instructions [here](../../identity/access-tokens.md?pivots=programming-language-python) for creating users and issuing access tokens. Alternatively, if you want to create the users on demand, you can create them using the `CommunicationIdentityClient`.
+In order to set up who can join a room, you'll need to have the list of the identities of those users. You can follow the instructions [here](../../identity/access-tokens.md?pivots=programming-language-python) for creating users and issuing access tokens. Alternatively, if you want to create the users on demand, you can create them using the `CommunicationIdentityClient`. ACS Rooms currently supports a room participant of type CommunicationUserIdentifier only, using other types of CommunicationIdentity will result in a runtime error.
 
 To use the `CommunicationIdentityClient`, install the following package: