I can't seem to get YesIntent and NoIntent working for the simple "yes" and "no" utterances. They are working just fine for things like "yeah", "sure", "no please" and so on.
Even if I create a custom YesNoIntent with the words, it still doesn't work.
The skill is pretty much a Hello World with handlers for the two intents. I had to add the intents in the model builder code editor as there weren't available from the list to select.
Am I missing something here? It's driving me crazy!