If your Text-to-Speech is not working, the reason could be that your app is not updated. In earlier versions of the app, the feature was not available for every country. Go to the Google Play Store on Android or the App Store on iOS devices to update your app. Search for "TikTok," and tap on "Update" if the option is available in its official Store entry. If updating doesn't solve the problem, you can try to reinstall the app. To do so, hold the TikTok icon and tap on "Delete." Then, go again to the Google Play Store on Android or the App Store on iOS devices to install TikTok again. A third solution is to update your phone. If your phone's operating system is not updated, it can cause compatibility issues with different apps, and some features may not work correctly.