Type is not marked indexable

I've created a new record type in my public CloudKit database (for the sake of example iCloud.my.container.name) using the CloudKit dashboard. I have not added any custom fields to the object and I've made the recordName field Queryable and the createdAt field Sortable.

I started a new SwiftUI project in Xcode 11 and set up a convenience function to access the CloudKit records:

Code Block 
final class CKContainerHelper: ObservableObject {
    @Published var latestCreationDate: Date?
	func fetchLatestRecord() {
		let truePredicate = NSPredicate(value: true)
		let query = CKQuery(recordType: "myrecord",
												 predicate: truePredicate)
		query.sortDescriptors = [
			NSSortDescriptor(key: RecordKey.creationDate,
								 ascending: false)
		]
		CKContainer
			.default()
			.publicCloudDatabase
			.perform(query, inZoneWith: .default) { [weak self] records, error in
			if let creationDate = records?.first?["creationDate"] as? Date {
				self?.latestCreationDate = creationDate
			}
			if let error = error {
				print("Encountered error: \(error)")
			}
		}
	}
}

Inside my SwiftUI view, I have a property for the CKContainerHelper:

Code Block 
@ObservedObject var helper = CKContainerHelper()

In the .onAppear, I have a call to self.helper.fetchLatestRecord(), but every time I run the App to request my custom record type (myrecord) I receive the following error:

Code Block 
<CKError 0x600001252ee0: "Invalid Arguments" (12/2015); server message = "Type is not marked indexable"; uuid = <some uuid>; container ID = "iCloud.my.container.name">

I don't see a way to mark my custom type as indexable in the iCloud developer portal.