you can choose to bulk add agents by selecting the Bulk Add option and then choosing the o365 option on the next page. When using the Bulk Add option, you need to authenticate with an o365 super admin user’s credentials (or a privileged admin role user) and then you will be redirected back to TTR where you will see a list of all the mailboxes on your o365 account. Simply tick the mailboxes you want to track and click Add and the mailboxes will be tracked by TTR. GSuite and Mimecast work in similar ways with different user roles and permissions required. Please view the Gsuite and Mimecast specific documentation to see how to add these types of mailboxes.
Once you have added your agents, your setup is complete and you can navigate away from the wizard.