Unable to tune into ATC

I’m flying into OMDB but the app doesn’t allow me to contact the approach controller. Any help?

Is there any approach controller?

Yup, the approach controller kept calling me to change to the frequency but I simply couldn’t without the button…

Hmm, interesting. Sometimes approach frequencies are merged and provide service for multiple airports next to each other. It looks like OMJS (APP) on the map. Maybe this trick could help!

In the ATC menu, there were only OMDB tower and OMDB ATIS, so I was confused