Cannot add new reference to script

This may help you with intellisense and Visual Studio problems:

Also, try update the VSCode package inside of Unity: Window → Package Manager → Search for Visual Studio Code Editor → Press the Update button

Also, this: No suggestions in Vscode

Remember, Visual Studios is irrelevant to Unity. You can actually edit all your files in notepad or any other text editor. What the solution or project says is irrelevant. Unity is the actual compiler used.

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