I cannot able to click button where NAF = true is defined when locating an element on appium inspector
Have you tried activating the screen first?
I had same issue but activating the screen before clicking the object inside an image with NAF = TRUE worked for me.
I sent an enter key before I put the xpath for searching the element like this:
driver.findElementByXPath("//android.widget.TextView[@text = ‘your text’]").click();
note: 66 code means Enter key.