Not sure if I ran into an error or if it was the end of the lesson, but when it asked me to pronounce "I want a coffee" and I repeated it - it didn't progress any further and just sat suspended there - dev console logs:
useSpeechRecording] Committed: Quiero un café.
index-DkqRIC0D.js:435 WebSocket closed: code=1000, reason="User ended session", wasClean=trueWas this on the trial page? It should get to the end and politely ask you to sign up.