Notification shows up in android emulator but not on physical device

Question

I have set a timely notification of 30 minutes using JobScheduler, my app shows the notification in Android Emulator(Pixel 3 API 29 Q-10) after 30 minutes but not on my physical device(Samsung S8 Android 9 Pie). The weird thing is the same notification shows up when I open the app after 30 minutes. Are there any restrictions in android?

I have tried so far:

• Running app in physical device using USB debugger mode, no errors.
• Building the APK and installing it in the device separately

Answer 1

I found that, If the phone is in power saver mode or any battery optimized mode the notifications won't show up. Turning off power saver mode worked for me.