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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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