Can't switch to Follow Me mode in QGC, Rover, Windows w/ GPS connected

I can’t switch to Follow Me mode in QGC. I’m using a windows PC/Tablet with a GPS attached. My setup is a Rover. I am able to Arm the system and go into Mission mode. QGC also shows the GCS location and the location will update if I move my computer. Any ideas why I can’t switch into Follow Me mode?