On adding new user to Cloud Orchestrator. It is possible to access Orchestrator but the Tenant window is blank. All other users can see the Tenant window.
Root Cause: This issue is experienced when the system time is not set correctly on the affected user's machine.
Resolution: Correct the system time, log out of all current instances of Automation Cloud and login again.
Also refer the Microsoft post How to set your time and time zone? .