I've used Nikon, Yongnuo and Godox hot-shoe flashes a D5300, D7100, D750 and D850 and I've never encountered what you're describing.Using an external flash on the hotshoe.
When you put the flash on the hotshoe BEFORE turning the camera on, the flash will not work.
When you put the flash on the hotshoe AFTER turning the camera on, the flash will work as normal.
Any comments?
Regardless of camera, I don't think that's normal behavior.Remember I am talking about the D5500. All my other cameras are fine.
Remember I am talking about the D5500. All my other cameras are fine.