Though the application has survey answers the API GET /domains/{domainId}/applications/{applicationid} is not displaying survey details as output.
Details
Use the REST API with the parameter expand=survey
GET /domains/{domainId}/applications/{applicationid}?expand=survey
eg
https://cloud.casthighlight.com/WS2/domains/xxxx/applications/xxxxx?expand=survey
Highlight API's
Additional Resources
CAST Highlight Troubleshooting Guides
CAST Highlight Product Documentation
Ticket
53264
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