Hi @jgonzalez2
Welcome to the Auth0 Community!
Reading through your use-case, I believe the issue lies with setting the correct audience for the application. Generally, if the application completed an OAuth flow without an audience being specified, Auth0 will issue an opaque token.
I recommend reading through the following Knowledge Article on this matter, that goes over the Value of the Audience Attribute in Access Token Requests and its Significance and how to correctly set it. Once completed, your should be receiving a valid JWT instead of an opaque token.
Hope this helped!
Gerald