Sign in With Apple email, firstName, lastName returning nil

I have implemented basic Sign in with Apple functionality to my app. When the app is launched, the user will be presented with a Continue with Apple view, where they can authenticate. Once signed in, they will return to a view that reads "Hello, [User's Name]". However, I cannot seem to figure out why the email and name return nil after authentication. For example, when authentication is successful, the HelloView simply reads "Hello, " with no name. I have it setup so that the users name and email are saved to AppStorage variables, and then inserted into a Profile class with SwiftData.

import AuthenticationServices
import SwiftData
import SwiftUI

struct ContentView: View {
    
    @Environment(\.colorScheme) var colorScheme
    @Environment(\.modelContext) var modelContext
    
    @AppStorage("email") var email: String = ""
    @AppStorage("firstName") var firstName: String = ""
    @AppStorage("lastName") var lastName: String = ""
    @AppStorage("userID") var userID: String = ""
    
    @Query var userProfile: [Profile]
    
    private var isSignedIn: Bool {
        !userID.isEmpty
    }
    
    var body: some View {
        VStack {
            if !isSignedIn {
                SignInView()
            } else {
                HomeView()
            }
        }
    }
}

struct SignInView: View {
    
    @Environment(\.colorScheme) var colorScheme
    @Environment(\.modelContext) var modelContext
    
    @AppStorage("email") var email: String = ""
    @AppStorage("firstName") var firstName: String = ""
    @AppStorage("lastName") var lastName: String = ""
    @AppStorage("userID") var userID: String = ""
    
    @Query var userProfile: [Profile]
    
    var body: some View {
        NavigationStack {
            
            Spacer()
            
            SignInWithAppleButton(.continue) { request in
                request.requestedScopes = [.email, .fullName]
            } onCompletion: { result in
                switch result {
                case .success(let auth):
                    
                    switch auth.credential {
                    case let credential as ASAuthorizationAppleIDCredential:
                        
                        // User ID
                        let userID = credential.user
                        
                        // User Info
                        let email = credential.email
                        print(email!)
                        let firstName = credential.fullName?.givenName
                        print(firstName!)
                        let lastName = credential.fullName?.familyName
                        print(lastName!)
                        
                        self.email = email ?? ""
                        self.userID = userID
                        self.firstName = firstName ?? ""
                        self.lastName = lastName ?? ""
                        
                        createProfile()
                                                
                    default:
                        break
                    }
                case .failure(let error):
                    print("Error signing in with Apple: \(error.localizedDescription)")
                }
            }
            .signInWithAppleButtonStyle(colorScheme == .dark ? .white : .black)
            .frame(height: 50)
            .padding()
            .cornerRadius(12)
            .navigationTitle("[App Name]")
        }
    }
    
    func createProfile() {
        let newProfile = Profile(firstName: firstName, lastName: lastName, email: email, userID: userID)
        modelContext.insert(newProfile)
    }
}

This is how I have my HomeView setup:

import SwiftData
import SwiftUI

struct HomeView: View {
    
    @Environment(\.modelContext) var modelContext
    
    @Query var user: [Profile]
    
    var body: some View {
        ForEach(user) { user in
            Text("Hello, \(user.firstName)")
        }
    }
}

#Preview {
    HomeView()
}

And here's the Profile class:

import Foundation
import SwiftData

@Model
class Profile {
    var firstName: String
    var lastName: String
    var email: String
    var userID: String
    
    init(firstName: String, lastName: String, email: String, userID: String) {
        self.firstName = firstName
        self.lastName = lastName
        self.email = email
        self.userID = userID
    }
}