Duolingo music and keyboard connection

Hiya, I got a keyboard and realised after I got the midi cable there’s no midi port on the back of the keyboard. The USB doesn’t work either.

Someone on another thread mentioned that it can do audiorecognition. Well I’ve tried on two IoS devices to change the settings and played the keys and there is no picking up the sounds.

Is there anyway to set this up? Any advice would be helpful.