I imagine I'm using the wrong terms.
TS401 can't tell the Subaru computer what the sensor ID's are - so it can't clear TPMS light. TS401 can read the sensor data. The instructions for the TS401 indicate you need another unit to actually upload the sensor ID's to the car's computer, then it will relearn them when you drive it. I was trying to use the DS708 to do that part, but TS401 cannot talk to DS708 nor the car. DS708 cannot get to a menu where you can manually input TPMS sensor ID's to cars' computer memory.