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Sophos Outlook Add-In Connection issue


I have a problem with the Outlook Add-In.

I have deployed the add-in to a customer. The customer is using an Office 2019 Pro version on Session Hosts server.

The add-in could also be installed successfully, but as soon as the customer wants to report a message, he gets the following error message:

Windows Firewall is disabled and does not seem to interfere. If he runs the add-in locally on his computer, it works.

So what settings on the server should I check so that the add-in can communicate externally?