Hi Jan,
For now, our developers are working on a solution. In the meantime, please comment and learn about the experience of other users in the main thread: DJI Mavic Pro Autofocus Issue (Android). I strongly suggest you do so that it relaunches the discussion 
One person reported having solved the issue by making the camera of the DJI Mavic Pro focus on something at the same distance as the flight altitude and then starting the mission.
I will now close this topic to comments, thank you for your understanding.