Windows 10 action center missing

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If I go to Settings > Taskbar Settings > Turn System Icons On or Off, the switch for Action Center is grayed out. If I flip it off & on again, the Notifications button still does not appear on the Taskbar.

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If I go to Settings > Notifications & Actions, the Notifications switch is turned on. I'm using Horizon Client version 5.5.2 build 18035009.

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The Windows 10 notifications Taskbar button and Windows Action Center are missing from my Horizon sessions, and despite all attempts they cannot be made to appear.