Emails not going to User chosen for a Role inside of workflow

I am using Windchill PDMLink Release 11.1 and Datecode with CPS M020-CPS08

In my workflow, the email notification does not send an email to the user assigned to a role when that role is in the Recipients. I recently added a group also to that notification and the group gets it, but the user does not.

Here are the errors that I faced
None