The new apis /v3/service-desk-integrations/ or /beta/service-desk-integrations/ are not working with sdmi created using the private api /cc/api/integration/createSimIntegration.
If I GET /v3/service-desk-integrations/ the response is an empty list.
Please open a support ticket. There have been other reports of this but our engineers need to see what is going on in a particular tenant to diagnose the issue.