The error message means that the add-in was able to find a matching employee record in NetSuite from the Outlook account's email address, but there is no profile assigned on the employee record in NetSuite.

How to Troubleshoot this Issue

To solve this issue, you'll need to ensure that the user’s employee record has a value for SuperSync Email Profile under the Access subtab in NetSuite.

Click here to learn more about how to assign profiles.