Okta.Sdk for C# winforms

Hi, need help here. I am managing the users at work specially for testing.
I have been bulk deleting them and creating a bunch of them at least 3x a week, Testing phase.
I have now written Collection Runners for this in Postman but still it requires me to do some things manually by getting the list of Users and extracting the ones I can delete. In short there are still some stuff I can’t automate in Postman and would like to write everything now in a windows forms where I can click a button then it will do it all for me.

Looking at the Okta.Sdk and trying out the Getting Started bit.
I can’t seem to connect properly. I can confirm that the variable values there are correct as it is working in a postman call.

I need help. Can’t seem to get to work the simplest call.