The integration was moved to UI configuration only in 2022.7, so you should not be adding anything to your config file. Whatever information source you are using is very out of date. Please check out the official docs for the Notifications for Fire TV integration.
FireTV notifications over adb have nothing to do with Alexa Media Player… the Notifications for Fire TV integrationwill create a new service for you to use.
Also make sure you install the Notifications for FireTV app on your FireTV.