There are several different methods Ombi can use to notify users about the status of their requests (approved, denied, available...).
If you enable a notification type at the server level, it will be used to notify any user that has a value under that notification type in their user details.
Note that this will run for every type they have enabled - so if they have Discord, Pushbullet, and WhatsApp, then Ombi will attempt to use all of the methods active.
They will be told via all of the methods they have details for.
This will duplicate notifications.
You have been warned.
Available methods include: