Hello @Tommy Elliott ,
Welcome to Microsoft Q&A forum.
Actually, per this document: Walkthrough: Calling Code from VBA in a Visual C# Project – Prerequisites
An edition of Visual Studio that includes the Microsoft Office developer tools. For more information, see Configure a computer to develop Office solutions.
You need to install(include) the
Microsoft Office developer tools, which just like what you found, the
Office Developer Tools for Visual Studio in VS Installer > Individual components.
Anyway, happy to hear that you have found the solution, have a nice day:)
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