Oath Connection always returning 401 in authorize block

I have an API that uses JTW but is not OAuth 2.0. I was able to use a Basic connection and authenticate with my API but I want to be able to use refresh tokens as well. When I try to use an Oauth 2.0 connection the “authorize” block always returns a 401 where the same call in Postman works. If I move the call to “token” it never fires and the connection acts like it worked. What is a good example of how to use an OAuth 2.0 connection without a redirect URL?