What does Windows error code 15637 (ERROR_INSTALL_OPTIONAL_PACKAGE_APPLICATIONID_NOT_UNIQUE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: ERROR_INSTALL_OPTIONAL_PACKAGE_APPLICATIONID_NOT_UNIQUE a main or another optional app package has the same application ID as this optional package.

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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 Application IDs 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: Get-AppxLog

Microsoft: Add-AppxPackage

Microsoft: Optional packages and related sets

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