Hi @jgleason
Welcome to the Auth0 Community.
My recommendation for obtaining a token and testing user authentication would be through the Authentication API debugger extension. This method is preferred since you will be able to leverage Auth0’s UI to perform various authentication flows.
However, if you would like to continue your development using Postman, then I recommend that you enable the Password grant in your application settings. This will allow you to exchange a user’s email/password for tokens. Note that you will want to disable the Password grant once you are done with testing.
Please let me know if you have any other questions, I would be happy to help.