Hi @Kohsuke,
Thanks for joining the Community!
You can configure two applications in one tenant, however, unfortunately Auth0 currently only supports biometric authentication in the Swift SDK for iOS (FAQ). I know that broader biometric authentication support is on the way, but there is not a public release date at the moment.
I’d encourage you to create a topic in the new Feedback category which our product team reviews: Feedback - Auth0 Community
To create two applications, simply go to the applications tab in your Auth0 dashboard and select “+ CREATE APPLICATION”. Once you choose which application type you are building, you can select a Quickstart that will walk you through either spinning up a sample app or integrating Auth0 into an existing app. When you are finished with the first application, you can select “+ CREATE APPLICATION” again to set up the second application.
Here is the Quickstart for the Android SDK: Auth0 Android SDK Quickstarts: Login