Showing Notifications in Ionic App when the app is killed from foreground

am building an ionic application for reminders. So, lets say a user schedules a reminder for 90 minutes from now on and then closes the app from multitasking bar. Now, I want to show him a notification after 90 minutes. How do I achieve this?

I tried using Cordova BackgroundMode for this purpose,, however my app crashes when I add this plugin.

So I shifted to one by Capacitor, called Background Tasks , , this does work if my app is just closed by pressing the back button. But if it is killed from multitasking bar, I do not see a notification.

Is there any way to achieve what I want to?