'Why is the @Junction annotation not being recognized?

I'm creating an associative entity in a class to represent an association between two other classes with Room on Android. I'm sure I'll kick myself, but can anyone tell me why the @Junction annotation isn't being recognized in this class?

public class CollectionWithGamebooks {


@Embedded
public Collection collection;

@Relation(
        parentColumn = "collectionId",
        entityColumn = "gamebookId",
        associateBy = @Junction(CollectionGamebookCrossRef.class))

public LiveData<List<Gamebook>> gamebooks;

}

Android Studio displays @Junction in red. Additionally, I noticed that the editor doesn't suggest the associateBy attribute when I started to type it, unlike the parentColumn and entityColumn attributes. I've cleaned and re-built the project and checked all the dependencies (everything else Room related is working fine) but I'm just not seeing this one.

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'Why is the @Junction annotation not being recognized?

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