Forum Discussion
jeffsbaker
Jul 18, 2026Brass Contributor
Edge version 150 JavaScript speechSynthesis.getVoices() undefined voices
For the past few days JavaScript speechSynthesis has had a problem in Edge browser. Sometimes it gets the proper list of voices but most of the time it returns: "Microsoft undefined Online (Natural) ...
jeffsbaker
Jul 24, 2026Brass Contributor
This seems to have been caused by an Edge update that affected more than just me. On the same day that I started having this issue, another user had the exact same issue and posted it at: https://learn.microsoft.com/en-us/answers/questions/5950089/the-microsoft-undefined-online-natural-undefined-k?source=docs . 30+ people said that they had the same question and the question is only 1 week old. This issue lasted for many days even with Edge updates. It appears that Microsoft Edge developers finally fixed the issue. It was still happening today until I updated Edge to Version 150.0.4078.99. As soon as I restarted Edge after the update then speechSynthesis text-to-speech started loading the Natural voices correctly.