I installed the mini-VCI and Toyota Techstream V13 as directed by a video on the installation CD.
Got as far as plugging into the car, opening Techstream, hitting "connect to vehicle", entered the long registration key......
So to answer my own question, Toyota Techstream does nothing on the PHEV, only the mini-VCI installation is required as a step to running MUT-3 with the Feedev drivers?
Under USB Controllers in Device Manager there is:
Vehicle Interface Module
and in COM ports:
USB Serial Port COM 3, FTDI, no errors.
2014 3H, 20K Miles
Bought June 2019
Rolec 32Amp EVSE