将域添加到AmazonSES以通过PHP/AWS SDK进行验证

我正试图从PHP向我的Amazon SES帐户添加一个域进行验证。我尝试使用以下代码：

$result = $amazonSesClient->verifyDomainDkim([
'Domain' => 'mydomain.com', // REQUIRED
]);

但它导致了这一点（注意，目前SES账户上没有可用的验证域）：

PHP Fatal error:  Uncaught exception 'Aws'Ses'Exception'SesException' with message 'Error executing "PutIdentityPolicy" on "https://email.us-west-2.amazonaws.com"; AWS HTTP error: Client error: `POST https://email.us-west-2.amazonaws.com` resulted in a `400 Bad Request` response:
<ErrorResponse xmlns="http://ses.amazonaws.com/doc/2010-12-01/">
  <Error>
    <Type>Sender</Type>
    <Code>InvalidPoli (truncated...)
 InvalidPolicy (client): Unable to parse policy. - <ErrorResponse xmlns="http://ses.amazonaws.com/doc/2010-12-01/">
  <Error>
    <Type>Sender</Type>
    <Code>InvalidPolicy</Code>
    <Message>Unable to parse policy.</Message>
  </Error>
  <RequestId>a900a249-f032-11e5-85bd-77394342cf29</RequestId>
</ErrorResponse>
'
exception 'GuzzleHttp'Exception'ClientException' with message 'Client error: `POST https://email.us-west-2.amazonaws.com` resulted in a `400 Bad Request` response:
<ErrorResponse xmlns="http://ses.amazonaws.com/doc/2010-12-01/">
  <Error>
    <Type>Sender</Type>
    <Code>InvalidPoli (truncated...)
' in in /var/www/html/bin/aws/Aws/WrappedHttpHandler.php on line 159

如果我手动添加域，它会按预期返回DKIM，但我如何以编程方式添加它？文档听起来像是该方法应该添加域进行验证，然后返回其DKIM记录？