“Missing” Accessibility settings. (TTS)

Checking on my side I seem to have the appropriate TTS options in0game, though I have seen other reports of folks claiming they don't have the options in-game. 

To me it sounds like there's some Xbox setting that's a factor here. I wonder if you have a friend (or just an alt) log into Apex, does it work on that account?

If it does, you could then check the various privacy/accessibility settings to determine what the holdup is. You mention going through them, but as you know there are a lot of options so perhaps there's some setting hidden off in some corner that's a factor. Do you have parental controls on your system?

I'll have a fiddle around on my side to see if I can get it to act in the same manner as your system, and hopefully we can figure this one out.