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TYPE_E_UNDEFINEDTYPE
What TYPE_E_UNDEFINEDTYPE actually isolates
TYPE_E_UNDEFINEDTYPE (0x80028027) reports that a type library references a type that is not defined in the available metadata. The useful diagnostic unit is the exact object and operation, not the product name alone.
Keep these facts stable
capture containing type library, referenced HREFTYPE/name/GUID, imported libraries, build artifacts, and producer version.
Corrective test
restore or define the referenced type in the producer metadata and rebuild the complete type-library dependency set. Avoid broad reinstalls or policy changes until that controlled test changes the result.
Technical references
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