How to authenticate and generate token native apps without login screen

Hi Team, I have a requirement for our .NET application where we have our DLL(assembly) which we are hosting in our intranet. This DLL will be used by several users within the company.
For this requirement we are planning to have new Okta app with list of users and groups/roles associated with it. To validate with the windows user is it possible without having any login screen to generate token for that user.

Perhaps you should take a look at the Direct Authentication API: Configure Direct Authentication grant types | Okta Developer