Hi John,
Thanks for reaching out to the forum. The Shared Reference Point extension is built into Civil 3D 2022 & newer. Prior releases will require you to download the add-on separately.
The Shared Reference Point extension can be accessed through the Autodesk Desktop App or through Autodesk Accounts page.
Additionally, you will need to download the extension separately for use in all versions of Revit.
In Civil 3D, go to Toolspace
Toolbox
Subscription Extension Manager
Autodesk Shared Reference Point 
Export Shared Reference Points for Autodesk Revit.

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