As a workaround, you can run this SQL directly against the database (this is for MySQL). It will enable the global My New Issues property for any user who does not already have it enabled.
Use at your own risk!
INSERT INTO properties (prop_key, resource_id, text_value, user_id) SELECT DISTINCT 'notification.SQ-MyNewIssues.EmailNotificationChannel', NULL, 'true', id FROM users WHERE id NOT IN (SELECT DISTINCT user_id FROM properties WHERE prop_key = 'notification.SQ-MyNewIssues.EmailNotificationChannel');