[THIN] Audio not working from WI client sessions

I'm running PS 4.0 and clients are using WI for connections. There was an email message that was broadcast to all users containing a url. When users click on the url the browser session launches fine but there is no audio.

However, when they launch a browser session from their WI page and paste in the same url, the audio works fine.

I've verified that the email application that's published is allowing audio. Not sure what/where else to look.

Thanks in advance for any help.

 

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Gary