Sometimes when an Email template is added to a campaign, admins are unable to receive emails for test notification sent.
The reason for this is that while creating the campaign and linking the email template, instead of clicking "Save" if we click on "Back" button we won't be able to receive the emails for test notification.
We recommend that while linking an Email template to any campaign, please make sure that first, you click on save, wait for "Last Saved: less than a minute ago" message to be displayed and then click on the back button.