Logging into Workforce Analytics on the Preview site returns an application error for a given role, similar to when the home page on Production is not present on Preview, but the page IS present on Preview and the role does not show "Undetermined" as the home page when viewed in Roles Maintenance on Preview.
SuccessFactors Workforce Analytics - Preview site
The home page may exist on Preview and Production with the same name but a different page ID. The site does not see them as the same report in this case, and one or the other site may not work for the role.
In a role which does work on both sites, open the home page report for the affected role in each site and take note of the page ID in the URL.
If they are different, use Report Transfer to download the version from the site that works and upload it to the site that doesn't. This will overwrite the other version of the report and the role will be valid on both sites.
KBA , LOD-SF-WFA , Workforce Analytics & Planning , Problem