NotificationDataSourceDefinition#messageTypes has been deprecated since 6.2.16. See https://git.magnolia-cms.com/projects/PLATFORM/repos/ui/pull-requests/1988/overview for details.

Check the new UI here:

• https://nightly.magnolia-cms.com/.magnolia/admincentral#app:tasks-app
• https://nightly.magnolia-cms.com/.magnolia/admincentral#app:notifications

Update the following pages:

• https://docs.magnolia-cms.com/product-docs/6.2/Apps/List-of-apps/Notifications-app/Notification-data-source.html (delete the messageTypes property)
• https://docs.magnolia-cms.com/product-docs/6.2/Apps/List-of-apps/Tasks-app.html (tabs no longer exist, so update the description and/or screenshots)
• https://docs.magnolia-cms.com/product-docs/6.2/Apps/List-of-apps/Notifications-app.html (tabs no longer exist, so update the description and/or screenshots)