Certifications are not assigned to the reviewer when the campaign status is "Preview Ready." The "Preview Ready" status indicates that the campaign is prepared for review by administrators, and the certification details can be previewed before launching the campaign. However, the certifications are only assigned to the reviewers once the campaign is in the "Active" status, which signifies the start of the certification process. At this point, reviewers can access the certifications assigned to them.
References:
* SailPoint IdentityNow Certification Campaign Lifecycle Guide.
* SailPoint IdentityNow Certification Campaign Status Documentation.