Windows error 1626 (ERROR_FUNCTION_NOT

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The requested Windows Installer function or action could not be executed in the current context.

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ERROR_INSTALL_PACKAGE_REJECTED	ERROR_FUNCTION_FAILED

ERROR_FUNCTION_NOT_CALLED

ERROR_FUNCTION_NOT_CALLED means that Windows Installer did not execute the requested function or action. The exact reason depends on the API and context; for example, restricted package handles permit only a defined subset of actions.

What to check

Record the specific MSI API or action name rather than treating 1626 as a package-install result.
Verify the handle type, installer version, and whether the call is made from a custom action or restricted context.
Review the documented return values for that API before adding a retry or fallback path.

Microsoft: MsiOpenPackageEx · Microsoft: custom action return values

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