PHP 中的开发人员身份验证错误

我是一名开发人员，试图用PHP连接到服务器。这是我用于服务器开发人员身份验证的代码：

    <?php
  require 'aws.phar';
   use Aws'CognitoIdentity'CognitoIdentityClient;
   use Aws'Sts'StsClient;
   use Aws'Credentials'Credentials;
   use Aws'S3'S3Client;
   $identityClient = CognitoIdentityClient::factory(array(
    'version' => 'latest',
    'region'  => 'ap-northeast-1'
    ));
  $idResp = $identityClient->getId(array(
    'AccountId' => 'XXXXXXXXXXX',
    'IdentityPoolId' => 'XXXXXXXXXXXXXX',
'Logins' => array(
  'cognito-identity.amazonaws.com:amr' => 'login.blupinch.app'
)
   ));
 $identityId = $idResp["IdentityId"];
 $tokenResp = $identityClient->getOpenIdToken(array(
'IdentityId' => $identityId,
'Logins' => array(
 'cognito-identity.amazonaws.com:amr' => 'login.blupinch.app'
)
));
$token = $tokenResp["Token"];

$stsClient = StsClient::factory(array(
'region'  => 'us-east-1',
'version' => '2011-06-15'
));
    $stsResp = $stsClient->assumeRoleWithWebIdentity(array(
     'RoleArn' =>'arn:aws:iam::XXXXXXXXXX:role/Cognito_appAuth_Role',
  'RoleSessionName' => 'App', // you need to give the session a name
  'WebIdentityToken' => $token
 ));

 $credentials = new Credentials(
    $stsResp['Credentials']['AccessKeyId'],
    $stsResp['Credentials']['SecretAccessKey'],
    $stsResp['Credentials']['SessionToken']
   );
   $s3Client = new S3Client([
  'version' => '2006-03-01',
  'region'  => 'us-east-1',
  'credentials' => $credentials 
   ]);

代码非常详细，我收到的以下错误消息也是如此。我很难理解这一点：

PHP Fatal error:  Uncaught exception           
'Aws'CognitoIdentity'Exception'CognitoIdentityException' with message     
'Error executing "GetId" on "https://cognito-identity.ap-northeast-     
1.amazonaws.com"; AWS HTTP error: 
Client error: 
`POST https://cognito-   identity.ap-  northeast-1.amazonaws.com` resulted  
in a `400 Bad Request` response:   
{"__type":"ValidationException","message":
"1 validation error detected: 
Value '{cognito-identity.amazonaws.com:amr=login (truncated...) 
ValidationException (client): 
1 validation error detected: 
Value '{cognito-identity.amazonaws.com:amr=login.blupinch.app}' at 'logins'      
failed to satisfy constraint: 
Map keys must satisfy constraint: 
[Member    must have length less than or equal to 128, Member must have   
length    greater than or equal to 1, Member must satisfy regular expression    
pattern: ['w._/-]+] - {"__type":
"ValidationException","message":
"1     validation error detected: 
Value '{cognito-    identity.amazonaws.com:amr=login.blupinch.app}' at        
'logins' failed to    satisfy constraint: 
Map keys must satisfy constraint: 
[Mem in    phar:///home/ubuntu/aws.phar/Aws/WrappedHttpHandler.php on

我相信错误与键cognito-identity.amazonaws.com:amr的值有关。所以我想知道，我应该为该键设置什么值？