No priority on trunked systems, yet...

Why is it there on Sentinel in my trunked system options?



I have a trunked P25 system and when editing it, I can scroll and see the option to enable any or all of my channels as priority. I then download this to my scanner, go to the scanner settings, priority scan, set priority, etc, then get a "Priority Scan, No Channel" message.



Why?

No priority on trunked systems, yet...