'CLion header files <vector>, <iostream> not known to be header unit?

I just installed Clion and am trying to write a short program in C++. However, when I try to import <iostream> or import <vector> I get

Header file <iostream> (aka '/Library/Developer/CommandLineTools/usr/include/c++/v1/iostream') cannot be imported because it is not known to be a header unit

The project is in C++ 20, in my CMakeLists.txt I did set(CMAKE_CXX_STANDARD 20)

I tried following the instructions here CLion C++ header files not found after macOS is updated to Catalina but it didn't resolve my issue

c++c++20clion


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