Hi,
Thanks for posting in Q&A platform.
Please make sure the following URLs are added in allow list:
remoteassistance.support.services.microsoft.com
relay.support.services.microsoft.com
channelwebsdks.azureedge.net
web.vortex.data.microsoft.com
gateway.channelservices.microsoft.com
*.lync.com
Refer this article for more info: Network configuration for Microsoft Managed Desktop
Best Regards,
Sunny
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