我正在尝试调用Shopify storefront GraphQL来创建客户。正在成功创建客户。但是，它不设置为突变提供的电话号码。
突变：

const String customerCreateMutation = r''' 
mutation MyMutation($firstName: String, $lastName: String, $email: String!, $password: String!) {
  customerCreate(input: {firstName: $firstName, lastName: $lastName, email: $email, password: $password}) {
    customer{
      acceptsMarketing
      createdAt
      tags
      displayName
      email
      firstName
      id
      lastName
      phone
   }
  customerUserErrors {
      code
      field
      message
    }
  }
}
''';

Graphql：

final MutationOptions _options = MutationOptions(
      document: gql(customerCreateMutation),
      variables: {
        'firstName': "john",
        'lastName':"doe",
        'email':"[email protected]",
        'password': "password",
        'acceptsMarketing': false,
        'phone': "9876543211", /// tried as "+919876543211" too
      },
    );
final QueryResult result = await _graphQLClient!.mutate(_options);

当我在结果中打印客户时，我得到的是result.data['customerCreate']['customer']，我可能得到的是null。

{__typename: Customer, acceptsMarketing: false, createdAt: 2023-10-19T12:56:35Z, tags: [], displayName: asdasd asdasd, email: [email protected], firstName: asdasd, id: ********, lastName: asdasd, phone: null, lastIncompleteCheckout: null}

在这里，它将电话作为null发送回去。
我也检查了Shopify商店中创建的客户。但它也是空白的。
如何设置客户的电话号码？还有别的办法吗