I have found the Nikon Z6 when attached with a flash sometimes struggles to focus on the subject.
Using Nikon’s NX software I can see where my camera was focusing when I took the shot. As you can see in the full frame image below it was sharp.
Then I took a second photo zoomed in to the couple.
After taking that second photo I noticed later it was soft.
I wasn’t pleased at all. I had been seeing this ad pop up in my social media for a while called Topaz Sharpening AI. You can download it and try it. It just puts a watermark on the photo. I tried it with this photo and ended up buying the software.
Here is a closeup of the difference.
While the software did improve the focus, when compared to getting it camera that is still the best.