SSO disable and re-enabled affecting user notifications

One of my users was converted from a contractor to full-time, and our IT team disabled their SSO on a Friday, then re-enabled it on a Monday. Same federated email address, the Workfront account was NOT deactivated. Now the user reports that they are getting no email alerts from Workfront. I "reset" the user using "resetUser" and confirmed that the SSO is working.

Does anyone have any suggestions to kick-start the email alerts again?