Hello @Daniel Ideho,
Thank you for your response.
Based on your statement, I understand that you created a training campaign and targeted specific users and groups. All users and groups included at the time of campaign creation received an email notification. However, as you mentioned, users added to the group after the campaign was created are not receiving the email.
To confirm this, I tested the scenario in my tenant and observed the same results. Email notifications are only sent to users who were part of the group when the campaign was initially created. Any users added to the group afterward will not receive the email.
To ensure all intended users receive the notification, please include them in the group before creating the campaign. Once the campaign is created, adding users to the group will not enroll them in the campaign.
I hope this clarifies your concern.