How to specify multiple audiences on authorize method

It is not supported to have multiple audiences in the access token.

You could authorize (could be silent authentication) a second time to use a different audience and as a consequence obtain an access token suitable to another API.

You could also configure Logical API for Multiple APIs. If you have multiple distinct API implementations that are all logically a part of the same API, you can simplify your authorization process by representing them with a single logical API in the Auth0 Dashboard. Doing this allows you to implement just one authorization flow, while still controlling access to the individual APIs by assigning the appropriate scopes.

Please send your request directly to our product team using our feedback page and click on the Vote button. Thank you!