TX power reduction with bap_broadcast_source

Hello, 

I'm trying to reduce the range of transmission of the nRF5340 SoC for an Auracast Broadcast. I would like it to be detectable only from a distance of 1 or 2 meters.

I've tried to force the TX_PWR to -20 dB in the configuration menu (west build -t menuconfig), but every time I try to build the project, there are configuring errors :

CMake Error at C:/ncs/v2.8.0/zephyr/cmake/modules/kconfig.cmake:396 (message):
command failed with return code: 1
Call Stack (most recent call first):
C:/ncs/v2.8.0/nrf/cmake/modules/kconfig.cmake:29 (include)
C:/ncs/v2.8.0/zephyr/cmake/modules/zephyr_default.cmake:133 (include)
-- Configuring incomplete, errors occurred!
C:/ncs/v2.8.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:66 (include)
C:/ncs/v2.8.0/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:97 (include_boilerplate)
CMakeLists.txt:4 (find_package)

Has anyone encountered this issue and resolved it?

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