Hello,
Using iOS 17.0, I can see a list of available voices. However, some will just not work, meaning that when selected there will be no sound produced and no errors.
This is true when using my app and AVSpeechUtterance, but it is also true in the settings where the preview button does nothing.
Hey there, thanks for taking the time to bring up this issue you are having. In order to get this information to the right team with the appropriate information, please take a few minutes to file a bug report using the Feedback Assistant tool, here https://developer.apple.com/bug-reporting/
Once you file a bug report, it'll be in our internal bug tracking system but you can feel free to reply here with your Feedback ID!