Using @ngrx/data, getting "No EntityDefinition for entity type [x]"

I am trying to use @ngrx/data to create a simple service in Angular, and am receiving the error EntityDefinition for entity type "Position". when the component runs.

My EntityMetadataMap is this:

const entityMetaData: EntityMetadataMap = {
  Employee: {},
  Position: {}
};

const pluralNames = { Employee: 'Employees', Position: 'Positions' };

export const entityConfig = {
  entityMetaData,
  pluralNames,
};

and my store module is this:

@NgModule({
  declarations: [],
  imports: [
    StoreModule.forRoot({}),
    EffectsModule.forRoot([]),
    StoreDevtoolsModule.instrument(),
    EntityDataModule.forRoot(entityConfig),
  ],
  providers: [
    {provide: DefaultDataServiceConfig, useValue: defaultDataServiceConfig},
    PositionsDataService
  ]

})
export class ItwStoreModule {
  constructor() {
    console.log(entityConfig);
  }
}

and my data service for position is this:

@Injectable({ providedIn: 'root' })
export class PositionsDataService extends EntityCollectionServiceBase<Position> {
  constructor(serviceFactory: EntityCollectionServiceElementsFactory) {
    super('Position', serviceFactory);
  }
}

I can put a break point in the module setup and in EntityDataModule and I can see that the entity definition exists and is getting set correctly (as part of EntityDataModule.forRoot(entityConfig).

But when the constructor of the service fires and calls super(...), in the debugger, I can see that there are no EntityDefinitions in the EntityCollectionServiceElementsFactory that is passed in (note the "definitions" are empty):

What am I doing wrong here? Obviously, between when the store module is initiated and when the dependency injection injects the EntityCollectionServiceElementsFactory into the service, something is going wrong.

You have a typo:-

It should be entityMetadata