Trying mbed-tools for first time

trying CLI 2 for first time, apparently the mbed_config.cmake is put into different location than the app.cmake in mbed-os expect it to be. The mbed-os version is 6.8

$ mbed-tools configure -m K64F -t GCC_ARM
mbed_config.cmake has been generated and written to ‘/cmake_build/K64F/develop/GCC_ARM/mbe
d_config.cmake’

$ cmake -S . -B cmake_build -GNinja -DCMAKE_BUILD_TYPE=release
CMake Error at mbed-os/tools/cmake/app.cmake:10 (include):
include could not find requested file:

<project>/cmake_build/mbed_config.cmake

Call Stack (most recent call first):
CMakeLists.txt:10 (include)