autoSignIn() only works in a happy path

[marapz]

Describe the bug

The same issue was found in the Android SDK: aws-amplify/amplify-android#3135

The autoSignIn() only works in a happy path, that is:

1. signUp
2. confirmSignUp
3. autoSignIn

But it gets stuck (no result returned from the autoSignIn() method) if I do this:

1. signUp
2. confirmSignUp with wrong code
3. confirmSignUp with correct code
4. autoSignIn <-- stuck

Previously this wasn't an issue for me, since I just performed the login for the user, and that always worked, but once we started using 2FA, the user was asked to enter the confirm account code, and then immediately after to enter the 2FA code.

Steps To Reproduce

1. signUp
2. confirmSignUp with wrong code
3. confirmSignUp with correct code
4. autoSignIn <-- stuck

Expected behavior

Amplify.Auth.autoSignIn() should return a value.

Amplify Framework Version

2.51.2

Amplify Categories

Auth

Dependency manager

Swift PM

Swift version

6

CLI version

.

Xcode version

26.0

Relevant log output

<details>
<summary>Log Messages</summary>


INSERT LOG MESSAGES HERE

</details>

Is this a regression?

Yes

Regression additional context

No response

Platforms

No response

OS Version

26.1

Device

iPhone 16 Pro

Specific to simulators

No response

Additional context

No response

[thisisabhash]

Hello, thank you for posting this. Our team will investigate and post updates here.

[thisisabhash]

I have verified the following scenarios and can confirm that it is working as expected on Swift.
All three scenarios below end up throwing an error.

1.
signUp
confirmSignUp
autoSignIn

Result findings:
An error occurred in auto sign in : AuthError: USER_AUTH flow not enabled for this client
Recovery suggestion: Make sure that the parameters passed are valid
Caused by:
invalidParameter

2.
signUp
confirmSignUp with wrong code
confirmSignUp with correct code
autoSignIn 

Result findings:
An error occurred in auto sign in : AuthError: USER_AUTH flow not enabled for this client
Recovery suggestion: Make sure that the parameters passed are valid
Caused by:
invalidParameter

3.
signUp
clear app data, signIn, still need to activate this account
confirmSignUp
autoSignIn

Result findings:
An error occurred in auto sign in : AuthError: USER_AUTH flow not enabled for this client
Recovery suggestion: Make sure that the parameters passed are valid
Caused by:
invalidParameter

Would you be able to provide

• code snippets of your login workflow
• the configuration file (including Gen1 CLI commands used to create it) redacted with all the sensitive information
• verbose logs during the reproduction steps
  ?

[marapz]

    @MainActor
    public func autoLogin() async throws -> AmplifyLoginResult {
        do {
            let result = try await Amplify.Auth.autoSignIn() // It doesn't give a result

            if result.isSignedIn {
                state = .loggedIn
                return .success
            } else {
                return .failure
            }
        } catch {
            throw AuthDataSourceError(error: error) // No error catch here
        }
    }

{
  "UserAgent": "aws-amplify-cli/2.0",
  "Version": "1.0",
  "storage": {
    "plugins": {
      "awsS3StoragePlugin": {
        "bucket": "xxx",
        "region": "eu-west-2"
      }
    }
  },
  "auth": {
    "plugins": {
      "awsCognitoAuthPlugin": {
        "UserAgent": "aws-amplify-cli/0.1.0",
        "Version": "0.1.0",
        "IdentityManager": {
          "Default": {
          }
        },
        "CognitoUserPool": {
          "Default": {
            "PoolId": "eu-west-2_c3mVldjmA",
            "AppClientId": "xxx",
            "AppClientSecret": "xxx",
            "Region": "eu-west-2"
          }
        },
        "Auth": {
          "Default": {
            "OAuth": {
              "WebDomain": "eu-west-2c3mvldjma.auth.eu-west-2.amazoncognito.com",
              "AppClientId": "xxx",
              "AppClientSecret": "xxx",
              "SignInRedirectURI": "xxx://",
              "SignOutRedirectURI": "xxx://",
              "Scopes": [
                "aws.cognito.signin.user.admin",
                "email",
                "openid",
                "phone",
                "profile"
              ],
              "QueryParameters": {
                "prompt": "select_account"
              }
            },
            "authenticationFlowType": "USER_SRP_AUTH",
            "loginMechanisms": [
              "PREFERRED_USERNAME"
            ],
            "signupAttributes": [
            ],
            "passwordProtectionSettings": {
              "passwordPolicyCharacters": [
              ]
            },
            "mfaTypes": [
            ],
            "verificationMechanisms": [
            ]
          }
        }
      }
    }
  }
}

3. Logs for path:
   signUp
   confirmSignUp with wrong code
   confirmSignUp with correct code
   autoSignIn

[REDACTED after fixing an issue]

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