Hi, Thanks so much for taking the time to respond. That explains it: I am building for MacOS as a direct target. Really unfortunate. I actually chose this option (over Unity's own stuff and indie dev approaches where they build a speech synthesizer) specifically because the docs for Unityplugins note that MacOS is supported. I couldn't find a note that clarifies the accessibility elements are only for iOS executables... If that documentation exists, I'd love to look it over. And if it doesn't, then perhaps consider adding a note about current support to the accessibility page. In any case, thanks again for the response. At least I know I didn't have something technical missing that I could have changed. Bummer not to be able to see whether my work actually worked before I turned it in, though.