Hi I am Diego Turati and I had the same problem. It’s sad, but UI Path is not ready to work with proxy authentication providing an User Name and Password, exactly as you do when you creat an HTTP Web Request using proxy for example.
In order to fix that problem you need to establish a VPN or include https://platform.uipath.com in your firewall rule in order to do not require proxy authentication for this url and make this site visible inside your network.
Hope I could help you with.
Rgds,
~Diego Turati
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