Disable the built-in notifications
I’ll describe how to disable the built-in notifications from Bitbucket on this page. This will be useful when using Notifyr - Notifications for Bitbucket as there is an overlap in functionality and notifications.
Go to the Bitbucket Administration using the cogwheel in the top right corner.
Find the Manage Apps section under the Add-ons menu.
Change the selection to All Apps and search for notification.
Disable the Bitbucket Server - Notification module.