At this time, you can not customize Training notifications sent within your campaigns. Here is what they look like - Notification Emails.
We recommend sending a welcome email ahead of time to ensure your employees are expecting the Training notifications.
Here is email content you can use:
We have the best news! Your Living Security Training Dashboard is being created! Get ready for live-action videos with immersive storylines, puzzles and challenges -and did we mention you'll be learning how to keep yourself and your company more secure from cyber threats?
You will soon recieve a notification from firstname.lastname@example.org. If you do not see this email, please check your filters.