invalid credentials for the request failed with http status 401: unauthorized

I am using Advosol’s OPC DA .NET Client Development Toolkit to connect to Milestone, but when I connect it shows me the following error “invalid credentials for the request failed with http status 401: unauthorized”

I show my configuration file:

<?xml version="1.0" encoding="utf-8" ?>

At Milestone Support we have no knowledge or experience with Advosol’s OPC DA .NET Client Development Toolkit. Not knowing how this toolkit might attempt to communicate with XProtect we cannot offer advice.

There might be partners following this forum that knows more and are able to say more.