nRF54H20 sysbuild hello_world fails to build

Hello!

Unchanged sysbuild hello_world example fails to build (v2.7.99-cs2/zephyr/samples/sysbuild/hello_world).

CMake Error at C:/ncs/v2.7.99-cs2/zephyr/samples/sysbuild/hello_world/sysbuild.cmake:5 (message):
  REMOTE_BOARD must be set to a valid board name

What REMOTE_BOARD shall be set to? Thanks!

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