Before you go through the Office 365 OAuth process, we need to setup the email template you would like tokened and inserted into your employees' mailboxes.
Go ahead and choose "Office 365 Mail Bug" when deciding on Canarytoken type.
Once you have clicked, "Let's begin", you can now setup your custom email template.
The text editor allows you to format the email content as you please. The user's email address can be added by placing the $user placeholder where relevant (this placeholder is not required). You may also customise the email's subject.
The hyperlinked "here" shows you where the web bug link will be placed. So be sure to add a message that would entice an attacker to click that link.
When ready, hit "Save Template" and your custom o365 token mail will be saved and you will start the Office 365 OAuth process.