Update teams-interoperability.md

Author: tomkau

articles/communication-services/how-tos/calling-sdk/teams-interoperability.md

@@ -49,7 +49,15 @@ const locator = {
 }
 const call = callAgent.join(locator);
 ```
+
+Join by using meeting id (this is currently in limited preview):
+
+```js
+const locator = { meetingId: '<MEETING_ID>'}
+const call = callAgent.join(locator);
+```
+
 ## Next steps
 - [Learn how to manage calls](./manage-calls.md)
 - [Learn how to manage video](./manage-video.md)
-- [Learn how to transfer calls](./transfer-calls.md)
+- [Learn how to transfer calls](./transfer-calls.md)