Hi @msontakke,
The opaque token is the Access Token you can use for the /userinfo endpoint to get user profile data. In order to get a JWT for the Access Token, you’ll need to provide an audience. The audience is the API Identifier of an API that you have registered with Auth0 (Register APIs).
As described in this topic, you can set the audience by configuring Extra settings under the Advanced tab in the plugin settings like so: {"auth":{"params":{"audience": "http://your-domain.tld/example"}}}
Related docs: Access Tokens