Yeah, but it’s on & off, or, up & down, or…
You get the picture 
Seems to me that the tts part is working, on my end at least. Eg. generating.
But the “unknown, no id3” .mp3 file resulting, is thrown away by MA, somehow.
The “turn-on-before-play” work around stopped working for me for a month or 2.
It was my last solution, now it seems harder to work around.