If you are trying to provision users in your dotnet web application, you can either
- JIT - Integrate your app with Okta through protocols such as OIDC or SAML and use just in time (JIT) provisioning based on the user claims you receive from Okta during user login
or - AOT - You can use protocol like SCIM or use Okta endpoints like how you are trying to do (but with private key JWT) to load user details into your system ahead of time (AOT)