It worked fine in our UAT environment but is failing when we move to production
It worked fine in our UAT environment but is failing when we move to production
In UAT were you connected to your production instance of World-Check or a Pilot Instance of World-Check? 404 suggests that something is incorrect in the custom mapping which is preventing the case from being created in World-Check. If it worked fine in UAT then the most likely reason for this is that the Group ID you specified in production is incorrect. Group Ids are unique to each World-Check environment so please check the IDs from your production World-Check and then check the mapping in your custom flows/apex is referencing the correct ID.
There is information on how to find the group id on the developer portal.