D7200 no longer autofocusing

Question

AF on the body of the camera
M/A on the lens
Back dial is not locked
I've tried clicking and holding the AE-L/AF-L button
Tried two different lenses
Battery is full
In the viewfinder, I see two arrows facing each other, sometimes one is showing, sometimes both. Can't seem to change from AFS, to AFA or AFC
Tried cleaning electrical contacts on both the body and lens.
I didn't change anything from one day to the next... it just stopped working. I did get a replacement 50MM Nikkor 1.8G lens, I put it on somewhat hastily with a bit of difficulty; it wasn't sliding in like the other lenses, but it did click in. Maybe that's what messed it up.
Can't seem to factory reset either by holding down exposure and iso.
At a loss for what's wrong

Michael C · Answer

If Auto ISO is selecting ISO 25600 at f/1.8 and 1/50 seconds, that means the light you are shooting in is VERY dim. It is equivalent to proper exposure for about EV -1.
It might not be enough light for the AF system on your D7200 to function properly, particularly if your focus target does not have a strong amount of contrast. Even though the AF system of your D7200 is rated to function down to EV -3, that rating is measured using a target with alternating white and black lines that provide plenty of contrast. The combination of low light and a low contrast target could be more than the AF system can handle, even if the light is slightly brighter than EV -3.

D7200 no longer autofocusing

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