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On the Attribute Revision Page, click Authentication Events.

Click on Lookup for the event that you are modifying. As an example, here we are going to update notification template of tenant users' resend invitation.

The current email template is as shown below.

Now, select the changed or new notification template. 

Note that the new notification template has been selected in Event Actions page.  Click Save button at the bottom of the page.

On the Attribute Revision page, click Return to Manage Revision.

Click Apply.

The modified invitation is now sent when the System Administrator resends an invitation to a tenant user.

Modified email notification sent to the tenant user when invitation is resent.