MLModelCollection beginAccessing returns empty deployments

Hi,

I'm experimenting with the new MLModelCollection stuff in Xcode 12 and iOS 14 and I'm having trouble.

I've created a Model Collection named "Collection" using the CoreML Model Deployment dashboard, added a Model to the collection, and created a deployment with an uploaded .mlarchive file. In the dashboard I can navigate to the deployment and see Model Assets, and I can download the assets (it appears to be a zip file that when opened contains weights and such). The mlmodel that I created the .mlarchive from works great when I drag and drop it into my project.

In my iOS app, following the instructions in the MLModelCollection help files, I call:

Code Block 
MLModelCollection.beginAccessing(identifier: "iNatTestCollectionID", completionHandler: modelCollectionAvailable)

My modelCollectionAvailable method looks like:

Code Block 
    func modelCollectionAvailable(result: Result<MLModelCollection, Error>) {
        switch result {
        case .success(let collection):
            print("Model collection `\(collection.identifier)` is available.")
            print("Model deployment id is \(collection.deploymentID)")
            print("Model collection entries are \(collection.entries)")
        case .failure(let error):
            print("got \(error) when accessing collection")
        }
    }

Unfortunately, the collection I get in the callback always has an empty deployment id and there are no entries in the collection.

I've tried waiting a few days in case there were syncing or deployment issues, but still nothing.

I do see this error in the console:
2020-11-03 15:12:27.600165-0800 ModelDeploymentTest[15009:910661] [coreml] MLModelCollection: experimentId unexpectedly not returned

But I'm not sure what that means.

Anyone have any advice?

Thanks,
alex