Unreal Engine build fails using SN-DBS with remote agent

Trying to get a clean test of building Unreal Engine 4.24 with SNDBS for comparison purposes. Normal parallel builds on my machine work fine, Incredibuild remote builds work fine, but SN-DBS, ONLY when I use a remote agent, gives me this 100% of the time:

(paths modified for privacy)

19>\UnrealEngine\Engine\Source\ThirdParty\Windows\VisualStudioDTE\VisualStudioDTE.h(24): fatal error C1083: Cannot open include file: ‘comdef.h’: No such file or directory
19>c1xx: note: This error occurred in injected text:
19> #injected_line 24 “\UnrealEngine\Engine\Source\ThirdParty\Windows\VisualStudioDTE\VisualStudioDTE.h”
19>
19>#include <comdef.h>
19>
19>dbsbuild : error : aborting build on error (2)
19>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.MakeFile.Targets(49,5): error MSB3073: The command “…..\Build\BatchFiles\Rebuild.bat LiveCodingConsole Win64 Development -WaitMutex -FromMsBuild” exited with code -1.
19>Done building project “LiveCodingConsole.vcxproj” – FAILED.