CW177: The Oly 12mm can be physically switched into a manual focus mode that prevents the app from changing its focus. You switch between manual and autofocus on the lens by sliding the focus ring forward or backward. The focus ring has ridges on it, circles the barrel of the lens, and sits just in front of the Aperture markings on the lens. If you slide that ring forward (toward the lens opening), you will expose a set of distance markings around the barrel of the lens. When the focus ring is in this position, the lens is pysically locked into manual focus mode. If you want the
I2 to be able to focus this lens via the app, the focus ring needs to be pulled back, so that the distance markings aren't visible, which then allows the app to autofocus the lens. So check the position of the focus ring.
I should add that the suggestions above about calibrating the lens using the Go4 lens calibration steps is misguided. Those steps do not affect the the focus quality you get when you use the app to autofocus the lens by tapping on the app screen. Really. All Lens Calibration does is teach the App what position to set the lens to when you select "Focus on Infinity" in the app's focus assist feature. I find that feature unreliable over time, so don't ever use it.