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Postman vs Mobile app endpoint calling - different CORS?

endpoint

#1

Migrating from the deprecated Xamarin.Auth0Client library and mimicking what it was doing, I’m trying to log in using a username and password that has been stored locally. The Xamarin.Auth0Client library was POSTing the password and username, amongst other keys, to the /oauth/ro endpoint.

Duplicating that REST call on Postman with the same data however is giving me an unauthorized client response.

POSTing to the oauth/token endpoint with the appropriate data is given me Access denied/Unauthorized.

Does anything on the Auth0 dashboard need to be configured differently when coming from Postman, as opposed to mobile apps? E.g. http://localhost added to CORS?