Auto tune help failing to load

I’m trying to set up auto tune on my pixhawk and taranis x9d radio I have a switch set up for it ,but when I flip the switch it says flight mode failed to load, I can set it to rtl and it enters that mode fine. The only thing I can thik of is I’m doing this on a bench to test to see if it’s going to work when I’m in the air. Should this work on a bench or do I have to be in the air to enter this flight mode

Hi, I think the answer is in your question.
It has to be in the air.