AI-generated Key Takeaways
- 
          Mobile application targeting errors are defined by the ApiErrorReasonenum within the specified namespace.
- 
          Targeting is restricted to applications linked to a store entry, as indicated by the CANNOT_TARGET_UNLINKED_APPLICATIONerror reason.
- 
          The UNKNOWNerror reason is used when the actual value is not accessible in the requested API version.
            ApiErrorReason enum for user domain targeting error.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| CANNOT_TARGET_UNLINKED_APPLICATION | Only applications that are linked to a store entry may be targeted. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |