Can't get position infomation with px4flow and ekf2

I am using px4flow for my position sensor with ekf2 for estimator, but there is no position infomation in LOCAL_POSITION_NED. I set the config following the developer guide. when I am looking at the analyze, the px4flow data seems good, the quality maintains between 190-210. I think the FMU have not used the data from px4flow.
I dont know how to do now.

Me Neither!
I need this Flow Camera for writing my master thesis. I have tried to connect PX4Flow to Pixhawk over one month. In fact I succeeded once on October 8, but only once. After that I lost LOCAL_POSITION_NED again.
Did you solved this problem now? If yes, please tell me.