ERROR_SECUREBOOT_NOT_BASE_POLICY: meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A supplemental Secure Boot policy was supplied where Windows requires a base policy.

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ERROR_SECUREBOOT_REQUIRED_POLICY_FILE_MISSING	ERROR_SECUREBOOT_NOT_SUPPLEMENTAL_POLICY

ERROR_SECUREBOOT_NOT_BASE_POLICY

ERROR_SECUREBOOT_NOT_BASE_POLICY (LRESULT 0x00001152) This Win32 error means a supplemental Secure Boot policy was supplied where a base policy is required.

What to check

Check the policy role in the deployment package before retrying.
Ensure the base policy is loaded first and any supplemental policies are deployed through the supported relationship to that base policy.
Do not rename or reclassify the file to force it into the base-policy slot.

Read-only checks

Get-SecureBootPolicy | Format-List

Base and supplemental policies are different policy roles, not interchangeable file names. Select the actual base-policy package for the device and establish it before deploying supplements that depend on it.

Microsoft: Get-SecureBootPolicy

Microsoft: Set-SecureBootUEFI

Microsoft: Secure Boot

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