Welcome to the community!
Are you requesting permission first with requestPermissions?
Basically something like this:
if (await LocalNotifications.requestPermissions()).display === 'granted') {
// continue with stuff
}
Do note that you only want to request permission once. After that, you use checkPermissions. The flow that I use is that once the user installs the app, I display a modal asking them to give permissions while explaining why they would want to.
Then on the screen where they can set notifications, I check if they granted permission. If they did, I let them continue. If they explicitly denied, I display a message saying that they didn’t grant permission and need to within the app settings in iOS in order to set a notification. if they didn’t accept or deny, then I show the request permission modal again (PermissionState = prompt).