I am trying to use ADM messaging for the first time, following the example here. https://developer.amazon.com/docs/adm/integrate-your-app.html I've created my credentials and the /assets/api_key.txt file contains the API key. Calling ADMManifest.checkManifestAuthoredProperly(this); does not return any errors. However, when I call adm.startRegister(), the callback never occurs.
I have breakpoints for onRegister, onUnregistered, onRegistrationError, onMessage as well as the constructors for both the Handler and the Receiver. Nothing is being called. I'm including my manifest file.