Consider the following scenario:
The group policy Remove the volume control icon is set to either Not configured or Disabled.
The group policy Hide the Notification Area is set to Enabled.
In the above scenario, the user does not see the volume control icon in the taskbar.
The group policy Hide the Notification Area takes precedence over the Remove the volume control icon policy.
Disable the Hide the Notification Area group policy.
Note: The same behavior can be observed when the same policies are applied through a different method other than Ivanti Workspace Control.