Only one resource not receiving email notifications

Document ID : KB000098145
Last Modified Date : 25/05/2018
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Only one resource is not receiving email notifications.  All other resources are receiving email notifications as expected
There is a process that sends email notifications to Resource Managers for timesheet approvals for each user.  Resource Manager is receiving emails for all of the resources except one.

Why does the Resource Manager not receive an email notification for this one resource?
PPM 15.3
Resources have to be given access to the Process.  

Looked at who has access to the Process
Made note of the Group
Looked at the resource details under Administration
Looked under Groups
The Resource was not part of the group with access to this Process
Added the Group to the Resource details