therwol wrote:
A moment of clarity. All of your QXD cards work fine in your D500. None of them work in your Z6ii. The specs of the Z6ii indicate that they should. The problem is with the camera. Don't waste money buying different cards. You can try the latest firmware, and that might overwrite something that's corrupted in the camera. If that doesn't help, send the camera to Nikon.
The problem is the XQD card. It doesn’t meet the requirements for the Z6. I had the same problem with the Z7.