im trying to get a notification in my app with a timer on it. i tried to watch some guides and get help from GPT and my Service just is not displaying my notfication for some reason
this is my service and for some reason the notification is not working i would be happy to know what did i do worng and how to fix it

To give more context, I am currently coding an application in Android Studio using Java, which is supposed to send a notification when it receives data. However, I’ve only managed to make it send a notification when the application is launched, which is not what I am trying to achieve. What I am looking for is for the app to make a request every 30 minutes to receive data, and then send a notification if the data is received. Is there a solution for this ?

explain screenshot
There is no clock icon here, but my app’s notification has Such icon, I need to not have it, It is very important that it does not exist