For those who still can’t make it work, try replacing the defines value from c_cpp_properties.json in your project with the following defines value: ue422-defines.txt - Google Drive
Use Find (CTRL+F) and search for MyProject, and replace it with your project name.
(This defines value is being copied from a project in UE4.22, if you have UE4.22, you can straight copy it from there)