Digital zoom cannot be used on the S9400 in the following situations:
-Scene Auto Selector Mode
-Night Landscape Scene Mode
-Night Portrait Scene Mode
-Backlighting Scene Mode with HDR set to on
-Portrait Scene Mode
-Easy Panorama Scene Mode
-Pet Portrait Scene Mode
-Smart Portrait Mode
-Auto Mode when shooting in Continuous>Multi-shot 16 mode
-Auto Mode with Subject Tracking is selected as the AF-area mode.
For more information on Digital Zoom please see page 76 of the Reference section of the S9400 manual. A copy of the S9400 manual can be downloaded from here:https://support.nikonusa.com/app/an...
If you continue to have trouble please contact Nikon Support: http://support.NikonUSA.com