WieWaldi Didn't work. And it cost me a long time to re-learn with fullsize keys. My fingers constantly hit the wrong notes. This is the true reason why I avoid mini-keys while I am in a beginner level.
Ok, late reply to this but... I have been thinking. Maybe you experienced the difficulty because you went from mini keys to full size? Perhaps it's like going from automatic to learning stick shift car: apparently that's hard. Or from electric guitar to acoustic, same. But the other way around is perhaps 5 minutes of adjusting, then you feel comfortable.
Of course with only 2 polycatic notes to play, it may be not the best litmus test. But it honestly wasn't hard - in fact the hardest part was to get the black keys to sound because they are very heavy to play. Now I want a "proper" mini keyboard just because I'm weird