@CynthiaFrench @CareyWard - If you enable text-to-speech for all assessments and for all students via the tracker settings, you shouldn't have to set individuals to have text-to-speech. However, if you set ANY of the students manually, the global tracker setting will change and newly added students will have to be set individually. If you have enabled text-to-speech for all students, and only some are able to use it, there may be something else going on. Also keep in mind that when a student is in multiple trackers, the text-to-speech option has to be turned on for them in each tracker; It does not stay attached to the student.
If you are still having issues and the reason is unclear, I recommend contacting support so they can look at your specific trackers and settings and investigate further. I hope this helps! - Jen