Valid toolchain unavailable for nRF54H20 Hello World sysbuild sample

I'm attempting to follow the introductory tutorial here using the NCS VSCode extension. After creating the new application from the sysbuild/hello_world sample in v2.7.99-cs2, I make a build configuration with the board target nrf54h20dk/nrf54h20/cpuapp and add the extra CMake argument -DSB_CONFIG_REMOTE_BOARD='"nrf54h20dk/nrf54h20/cpurad"'. The system build is set to "Use sysbuild". When attempting to build, I get the following error:

CMake Error at /home/rbmarcus/ncs/v2.7.99-cs2/zephyr/modules/hal_nordic/CMakeLists.txt:18 (find_package):
  Could not find a configuration file for package "nrf-regtool" that is
  compatible with requested version "5.6.0".

  The following configuration files were considered but not accepted:

    /home/rbmarcus/ncs/v2.7.99-cs2/zephyr/modules/hal_nordic/nrf-regtool/nrf-regtoolConfig.cmake, version: 5.3.2

Based on this output, I assume the build is gated to toolchain versions that match the customer sampling release, but the newest toolchain available is v2.7.0:

rbmarcus@nordic-devzone:~/Projects/hello_world$ nrfutil toolchain-manager search
Version  Status
v2.7.0   Installed
v2.6.2   Not installed
...

Is this resolvable on my end? Are there any other underlying problems with the way I'm configuring the project that could be causing this?

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