M’Benga still wears blue. Chapel wears white, but she’s also a civilian contractor in SNW and hasn’t joined Starfleet yet, so how her uniform color interacts with everyone else is unclear.

Fun fact - the actress under that makeup also went on to play the Female Changeling.

I suspect she never learned how to read faces or tell tones of voice apart, which is why has so many problems when her empathic powers are supressed. She can sense sarcasm through an opaque soundproof wall, so why would she need to know that people sound different when they’re being sarcastic?