After Install: Failed to locate html-validate library.

I keep getting the following message. This is even after running npm install --global html-validate:

Failed to locate html-validate library.

html-validate must be installed either in workspace or global. Use one of:

nom install --save-dev html-validate
npm install --global html-validate

When I run which -a I see:

/usr/local/bin/html-validate

What am I missing here? Why is vscode-html-validate not picking up the global install of of html-validate?