ATSC 3.0 and subtitles

This is one issue that still bothers me - no subs on the 3.o feeds. I've read reports in posts here of people getting subs with the 3.0 feed. I'm using Silicondust 4K tuner and get nothing either via Channels on my FS or TS4K. I'm using the Beta software, am I missing something? I'm in the Detroit Market as is one of the posters I"ve read who is getting subs.