亚马逊认知JS SDK

我正在尝试使用他们的JavaScript SDK来理解认知认证。我有以下代码(由React应用程序中的表单触发):

import {
    CognitoUserPool,
    AuthenticationDetails,
    CognitoUser
} from "amazon-cognito-identity-js";

const poolData = {
    UserPoolId: MY_POOL_ID,
    ClientId: APP_CLIENT_ID
};

export function cognitoLogin(credentials, callback) {
    const authenticationDetails = new AuthenticationDetails(credentials);

    const userPool = new CognitoUserPool(poolData);
    const cognitoUser = new CognitoUser({
        Username: credentials.username,
        Pool: userPool
    });

    cognitoUser.authenticateUser(authenticationDetails, {
        onSuccess: function(response) {
            console.log("SUCCESS!");
            console.log(response);
        },
        onFailure: function(error) {
            console.log("FAILURE!");
            console.log(error);
        }
    });
}

我生成了一个没有秘密的客户端应用程序。我生成了一个用户,并使用自定义域用户界面登录该用户并进行确认。但是,当我尝试通过sdk登录时,我得到一个

{
    code: "NotAuthorizedException",
    message: "Incorrect username or password.",
    name: "NotAuthorizedException"
}

错误。我能错过什么?