Unable to connect to server

[Ralileo16]

I'm having a hard time pin pointing the issue i'm facing. I'm developping an asp.net core API that will act as the backend for a web app, and I need to include a OPC Client that will listen on some specific nodes for data change notifications and read / write abilities. I cannot get the client to connect to the server no matter what i try. I even made a small python app, i can connect just fine to the OPC server. Also i can connect using UAExpert. So my questions is what could be the issue as to why i cant authenticate myself on the server. I keep getting errors stating that my server does not support either anon / username login