App works fine in device when using 'ionic cordova run android' but http.post feature stops working when deployed to play store

When testing the app with ‘ionic cordova run android’ on my cellphone, everything works fine. The problem comes after I download the same app from the play store. Apparently the problem revolves around the POST event:

this.http.post(‘https://chinchon.ga:8080/checarPonente’, JSON.stringify(this.myForm.value), {headers: { ‘Content-Type’: ‘application/json’ }}).subscribe(res => {
console.log(res);
if(res == true){
this.navCtrl.push(SpeakerPage);
}else if(res == 404){
let alert = this.alertCtrl.create({
message: “The user provided does not exist”,
buttons: [{
text: “Ok”,
role: ‘cancel’
}]
});
alert.present();
}else if(res == 405){
let alert = this.alertCtrl.create({
message: “The user or password are wrong”,
buttons: [{
text: “Ok”,
role: ‘cancel’
}]
});
alert.present();
}
});

Does anyone know how to solve this? Or why this is happening?