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STATUS_CHILD_PROCESS_BLOCKED
Child-process creation was denied by policy
Windows returns STATUS_CHILD_PROCESS_BLOCKED when process security or execution policy rejects the requested state or operation. The parent process is running under a mitigation or application-control rule that prohibits creating child processes. The executable path of the child may be valid yet still be blocked by the parent policy.
Capture parent and child command lines, creation flags, mitigation attributes and policy events. Move the operation to an approved broker or redesign the workflow.
Check whether the parent intentionally opted into a child-process restriction or inherited it from application control. The first denied creation event should identify the policy source more reliably than retries with altered command lines.
References
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