2402 changed the graphics default from DOD to IDD. Make sure to update the endpoint to the latest CWA, and if that doesn't work, try changing the priority. https://support.citrix.com/s/article/CTX237608-display-adapter-priority-and-monitor-creation-in-citrix-sessions?language=en_US

Thank you - CWA is 2402 LTSR CU2, i'll try to change the priority to see if it has any effect.