Dynamics CRM 401 with token provided
Here is a post on how to configure server to server auth. Assuming you ran through all the steps except creating the application user, you can do so by:
- In CRM Navigate to Settings->Security->Users
- Change the view from "Enabled Users" to "Application Users"
- From the new user form change the form from "User" to "Application User".
You should now be able to create your application user.