Using actor framework in Visual Studio - c++-actor-framework

Question

This is my first time working with actor framework in windows. I am having success building the examples using CMake however when I open the generated project using Visual Studio I am seeing many errors. It is strange because I can build and run the project in VS even though it reports hundreds of syntax errors.
I have tried two different approaches, both with similar results:
Approach I: Conan
Create new directory then add hello_world.cpp and this conanfile.txt
[requires]
caf/0.18.5
[generators]
cmake
Create build directory and from there run conan install ..
Added the following CMakeLists.txt in the working directory:
cmake_minimum_required(VERSION 2.8.12)
project(CafHelloWorld)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED True)
include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
conan_basic_setup()
add_executable(hello_world hello_world.cpp)
target_link_libraries(hello_world ${CONAN_LIBS})
run cmake .. G "Visual Studio 16"
run cmake --build . --config Release
The exe runs great but when I open the project in VS, it reports hundreds of syntax errors (mostly in the caf header files). I can build and run the project from VS though.
Approach II: Source
Download source from github and add build directory
Open CMake GUI and point to source and build directories
Press "Configure" and select "Visual Studio 16 2019"
CMake complains about OpenSSL. I disable the OpenSSL Module(don't think I will use it) then hit configure again. Error goes away.
Hit "Generate" then "Open Project"
The result is similar. hello_world.cpp has a handful of errors and Visual Studio reports hundreds more from the caf header files. The project builds though. Am I missing something obvious?