How does the speech recognition tool work?
The speech recognition measures how well your pronunciation matches that of the audio track you are hearing. The tool will give you a rating of 1-100 but you will only see ratings of 50 and above.
If you don't see any rating, it may be that the microphone sensitivity needs adjusting. Try speaking either louder or quieter and, if that does the trick, adjust the sensitivity accordingly. It may also be the case that you are starting to speak too soon: only speak after the green dot appears in the microphone icon.