Sometimes the name of a package is different than you believe it is. You can find out what name to install with a search like this: sudo eopkg sr (app name)
.
In this case, sudo eopkg sr vsc
produces the result:
vscode-dbginfo - Debug symbols for vscode
vscode - Visual Studio Code (open source version) is a new type of tool that combines the simplicity of a code editor with what developers need for their core edit-build-debug cycle.
So to install it, you should try: sudo eopkg it vscode
.