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An error when doing IM with UCMA 3.0 application endpoint app

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I have implemented a simple UCMA 3.0 application on my Lync server machine, which creates an application endpoint and establishes IM calls to Lync users. When I start the application, everything is registered ok, and a toast message is received on Lync clients with an initial message. I can send messages from the UCMA application, but when I type in some text and send it back to UCMA app, there is an error that displays in conversation window:

When contacting your support team, reference error ID 504 (source ID 239). 

Troubleshooting information is available online, including best practices for using Lync.


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