I took a snippet of your code from the website and put it into a simple 'hello world' app to test it out. This is a console application with a .NET core 3.1 target using Visual Studio 2019. I am using QuickOPC 5.59.0-rev13. The full code is at the bottom of the post.
When I run the application I get this:
*** Failure: The requested OPC Alarms&Events technology 'Com' is not supported. Check the scheme "opcda" in server URL string "opcda:Matrikon.OPC.Simulation.1".
Note that I am trying to connect for A&E information, but it is appending "opcda:" to the beginning of the connection string that it returns. I get the same error when I use the OPCLabs event server.
When I run the application I get this:
*** Failure: The requested OPC Alarms&Events technology 'Com' is not supported. Check the scheme "opcda" in server URL string "opcda:Matrikon.OPC.Simulation.1".
Note that I am trying to connect for A&E information, but it is appending "opcda:" to the beginning of the connection string that it returns. I get the same error when I use the OPCLabs event server.