diff --git a/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/AWSAuthBaseTest.swift b/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/AWSAuthBaseTest.swift
index 7bbef1de02..fa4a455bde 100644
--- a/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/AWSAuthBaseTest.swift
+++ b/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/AWSAuthBaseTest.swift
@@ -9,15 +9,17 @@ import XCTest
 @_spi(InternalAmplifyConfiguration) @testable import Amplify
 import AWSCognitoAuthPlugin
 
+fileprivate let internalTestDomain = "@amplify-swift-gamma.awsapps.com"
+
 class AWSAuthBaseTest: XCTestCase {
 
     let networkTimeout = TimeInterval(5)
 
-    var defaultTestEmail = "test-\(UUID().uuidString)@amazon.com"
+    var defaultTestEmail = "test-\(UUID().uuidString)\(internalTestDomain)"
     var defaultTestPassword = UUID().uuidString
 
     var randomEmail: String {
-        "test-\(UUID().uuidString)@amazon.com"
+        "test-\(UUID().uuidString)\(internalTestDomain)"
     }
 
     var randomPhoneNumber: String {
diff --git a/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/MFATests/EmailMFATests/EmailMFAOnlyTests.swift b/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/MFATests/EmailMFATests/EmailMFAOnlyTests.swift
index 6f1be2aa0e..06c899c2b5 100644
--- a/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/MFATests/EmailMFATests/EmailMFAOnlyTests.swift
+++ b/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/MFATests/EmailMFATests/EmailMFAOnlyTests.swift
@@ -86,7 +86,7 @@ class EmailMFARequiredTests: AWSAuthBaseTest {
 
             // Step 5: Provide the email address to complete MFA setup
             var confirmSignInResult = try await Amplify.Auth.confirmSignIn(
-                challengeResponse: username + "@integTest.com")
+                challengeResponse: defaultTestEmail)
 
             // Step 6: Ensure that the next step is to confirm the Email MFA code
             guard case .confirmSignInWithOTP(let deliveryDetails) = confirmSignInResult.nextStep else {
@@ -121,7 +121,7 @@ class EmailMFARequiredTests: AWSAuthBaseTest {
 
             // Step 9: Verify that the email is associated with the user account
             let attributes = try await Amplify.Auth.fetchUserAttributes()
-            XCTAssertEqual(attributes.first(where: { $0.key == .email })?.value, username + "@integTest.com")
+            XCTAssertEqual(attributes.first(where: { $0.key == .email })?.value, defaultTestEmail)
         } catch {
             XCTFail("Unexpected error: \(error)")
         }
@@ -154,7 +154,7 @@ class EmailMFARequiredTests: AWSAuthBaseTest {
             _ = try await AuthSignInHelper.signUpUserReturningResult(
                 username: username,
                 password: password,
-                email: username + "@integTest.com")
+                email: defaultTestEmail)
 
             let options = AuthSignInRequest.Options()
 
diff --git a/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/MFATests/EmailMFATests/EmailMFAWithAllMFATypesRequiredTests.swift b/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/MFATests/EmailMFATests/EmailMFAWithAllMFATypesRequiredTests.swift
index 88dd39ec57..fcbfe6d64d 100644
--- a/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/MFATests/EmailMFATests/EmailMFAWithAllMFATypesRequiredTests.swift
+++ b/AmplifyPlugins/Auth/Tests/AuthHostApp/AuthIntegrationTests/MFATests/EmailMFATests/EmailMFAWithAllMFATypesRequiredTests.swift
@@ -96,7 +96,7 @@ class EmailMFAWithAllMFATypesRequiredTests: AWSAuthBaseTest {
             // Step 1: Set up a subscription to receive MFA codes
             createMFASubscription()
             let uniqueId = UUID().uuidString
-            let username = "\(uniqueId)@integTest.com"
+            let username = randomEmail
             let password = "Pp123@\(uniqueId)"
 
             // Step 2: Sign up a new user with email
@@ -190,7 +190,7 @@ class EmailMFAWithAllMFATypesRequiredTests: AWSAuthBaseTest {
 
             // Step 7: Provide the email address to complete the setup
             confirmSignInResult = try await Amplify.Auth.confirmSignIn(
-                challengeResponse: username + "@integTest.com")
+                challengeResponse: defaultTestEmail)
 
             // Step 8: Verify that the next step is to confirm the Email MFA code
             guard case .confirmSignInWithOTP(let deliveryDetails) = confirmSignInResult.nextStep else {