SwiftUI and CoreData

I am getting an error when trying to fetch objects in SwiftUi in a form sheet modal in iOS 13.

Here's the error:

[SwiftUI] Context in environment is not connected to a persistent store coordinator: <NSManagedObjectContext: 0x600003218620>

I am able to run a fetchRequest from a list view, but not in the modal.

Has anyone else seen this issue?

I set the Environment context in the SceneDelegate:

if let windowScene = scene as? UIWindowScene {
      let window = UIWindow(windowScene: windowScene)
      let managedObjectContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
      //managedObjectContext.mergePolicy = NSMergeByPropertyStoreTrumpMergePolicy
      window.rootViewController = UIHostingController(rootView: ContentView().environmentObject(sampleViewModel).environmenbject(customerViewModel).environment(\.managedObjectContext, managedObjectContext))
      self.window = window
      window.makeKeyAndVisible()

In the ContentView:

import SwiftUI

struct ContentView: View {
    @State var isPresented = false
    
    var body: some View {
        NavigationView {
            VStack {
                // Search bar, filter, and divider
                SampleListView()
            }
            .sheet(isPresented: $isPresented) {
                NewSampleView()
            }
            .navigationBarTitle("Samples")
            AddSampleButton(isNewSamplePresented: $isPresented)
        }
    }
}

Able to see items in the SampleListView:

struct SampleListView: View {
    @EnvironmentObject var viewModel: SampleListViewModel
    @FetchRequest(fetchRequest: Sample.allSamplesFetchRequest()) var samples: FetchedResults
    var body: some View {

        List(self.samples) { sample in
            VStack(alignment: HorizontalAlignment.leading) {
                NavigationLink(destination: SampleView(activeSampleModel: ActiveSampleViewModel(sample: sample))) {
                    Spacer()
                    Text(sample.trackingNumber ?? "")
                    Spacer()
                    Text(sample.sampleId ?? "")
                    Spacer()
                }
            }

        }
    }
}

But I get the error when presenting the NewSampleView (I've tried using a fetchRequest defined in the view as well as one defined in the NSManagedObject subclass but the fetch is always failing with the above error) :

import SwiftUI
import CoreData

struct NewSampleView : View {
    @State var customerId = ""
    @State var sampleDate = Date(timeIntervalSinceNow: 0)
    @State var receiptDate = Date(timeIntervalSinceNow: 0)
    @State var customerServiceSampleNumber = ""
    @State var notes = ""

    @Environment(\.managedObjectContext) var managedObjectContext
    @FetchRequest(fetchRequest: fetchRequest(), animation: nil) var customers: FetchedResults
    
    var body: some View {
        
        List(self.customers) { customer in
            VStack(alignment: HorizontalAlignment.leading) {
                    Spacer()
                    Text(customer.customerId ?? "")
                    Spacer()
                }
            }
    }
    
    
    static func fetchRequest() -> NSFetchRequest {
        let request: NSFetchRequest = Customer.fetchRequest() as! NSFetchRequest
        request.sortDescriptors = [NSSortDescriptor(key: "name", ascending: true)]
          
        return request
    }