I own a very nice Korg PA 50 and I am very proud of it

I am learning piano and I trying to learn by the app called "Simply piano".
For better recognition of what I play, the app suggest me to connect from the MIDI connection to my mobile by a Cable.
please, look at the cable
https://screenrec.com/share/Go03Anp89Z
when I connect my Android mobile, there is no recognition! And the app can not here the PA 50 by cable.
I have to turn on the speakers, then the app here the PA 50.
Am I doing the connection correct?
Do I need some other kind of cable?
Do I need to configure my PA 50 in some how?
Regards