I completed the ftp test on the watch and at the end it said no ftp was detected! I also use Garmin Vector 3s pedals and in GC it says my 20 min max average was 225 watts, but no FTP. The last FTP it recorded was in January and since that last known value I've had 20 cycling workouts at least and hour each. This was the first time I've done the guided ftp test on my watch. It seems like my watch stopped recording FTP values, yet show my power in each cycling workout
I had this issue, too. I did the Garmin guided FTP test from my Fenix 5X, using a Cycleops Hammer as the power meter. It kept ramping up difficulty, and when its requested power level exceeded the level my legs could give, it failed out. Then, when I backed out of the test, the base watch OS said "New FTP of 266W detected!".
