If it's the same version of the Sidebar executable, the origin of the issues is to be searched in the configuration.
If it works locally, but not with a Citrix sessions, please compare the HCU reg keys. Verify if the EfficyDrive is enabled and that a drive folder is set?
I had to set these keys on 11.2 to make it work. However, I was also unable to show the Drive configuration page in Sidebar as described on help.