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ERROR_INSTALL_OPTIONAL_PACKAGE_APPLICATIONID_NOT_UNIQUE
ERROR_INSTALL_OPTIONAL_PACKAGE_APPLICATIONID_NOT_UNIQUE means an optional package duplicates an application ID already used in the main package or another optional package.
This is a package-authoring conflict. Fix the package manifests and rebuild the related set; removing unrelated installed packages does not make duplicate application IDs valid.
What to check
- Compare the
ApplicationIDs in the main package and all optional package manifests. - Give each application declaration a unique ID within the related set, then rebuild the bundle or App Installer definition.
- Retest the complete related set together so that the rebuilt metadata is consistent across every package.
Microsoft: App package deployment troubleshooting
Microsoft: Optional packages and related sets
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