handle but not showing push notification on Mi Max 2 Android 7.1.1 and Xiaomi Redmi 8 pro Android 10

When handle push notification in service and use code below, notification not showing in app.

 notification(context, channelId, smallIcon = R.mipmap.ic_launcher, ) {
            contentTitle(title)
            contentText(content)
            priority(NotificationCompat.PRIORITY_HIGH)
        }
        
        Link to app https://github.com/zloykurd/notificationApp