Hi Sagi,
I have different camera model (Oly EM1II and Pana 45mm and Zuiko 60mm macro lenses), but the short answer is universal: if AF does not work, you need to focus manually. In case this is not possible (no Focusgear, or, as in my case, Focusring is not really working for manual focus) you can preset focus to 1:1 (I tried this several times with my system, in my hands most troublesome method)...
But maybe you can tweak AF to better performance: Disable any face/subject recognition, any automatic mode and assign the smallest spot possible for focusing. Assign a button different from shutter release button to S-AF. Try to S-AF. When this works, one could try C-AF&tracking...
factors that may help S-AF: #1.: focus light, #2.: maybe there is a switch on the lens to limit the distance to close distance, #3.: try different focus settings on the camera (focus speed and/or sensitivity)...
Eager to hear how it works for you...
Wolfgang