We have noted that the service Catalog end point value needs fully qualified domain name (FQDN) for this to work.
i.e. below are the steps
1. Login to Service Desk as Administrator
2. Go to Administrator Tab
3. Click on Options Manager - CA Service Catalog - casc_endpoint
4. update the value to a fully qualified domain name server i.e. http://xxxx.xxx.xxx:port/usm/services
5. Save and close the window.
6. Recycle the SDM services.
7. Validate the behavior once again and let me know when switching to service point and on select my tickets you should be able to see the tickets page.
Let us know if this helps