I've just received a new Forerunner 255 and a new HRM 600. Purchased from Amazon. Trying to pair the HRM 600 to the Forerunner 255. The screen shows only "Sensors Found" but does not list the HRM 600. The watch will not pair to the HRM. I have paired the HRM 600 to the Garmin Connect app successfully and the app does track the HR from the HRM 600. Seems to be an issue with the watch. I have tried all of the shutdown, charge them, restart, etc. from the other questions.