Csharp .NET Google Workspace API获取错误CS0266

我正在生成一个用户，并将他们填充到我们的Google Workspace环境中，但我似乎无法使CustomSchemas工作. 我已经摆弄了几种不同的格式化方法，但我仍然无法让它正常工作.

userGoogleUserWithData = new User()
{
    PrimaryEmail = userEmail,
    Password = generatedPassword,
    Name = new UserName
    {
        GivenName = givenName,
        FamilyName = familyName
    },
    ChangePasswordAtNextLogin = true,
    OrgUnitPath = "/",
    Suspended = false,
    Relations = new List<UserRelation>
    {
        new UserRelation { Type = "manager", Value = googleData.manager } // Set the manager's email
    },
    Addresses = new List<UserAddress>
    {
        new UserAddress
        {
            Type = "work",
            Formatted = googleData.locationAddress,
            Locality = myBranch.branchCity,
            Region = myBranch.branchState,
            PostalCode = myBranch.branchZip,
            Country = myBranch.branchCountry
        }
    },
    Organizations = new List<UserOrganization>
    {
        new UserOrganization
        {
            Title = googleData.jobTitle,
            Primary = true,
            Department = googleData.department,
            CostCenter = googleData.costCenter,
            Description = "user",
            Name = "Test Company"
        }
    },
    CustomSchemas = new Dictionary<string, object>
    {
        ["Custom Field Testing"] = new Dictionary<string, string>
        {
            ["blah text"] = "Test Value"
        }
    }
};
service.Users.Insert(userGoogleUserWithData).Execute();

自定义现场测试和BLAH文本应该是我工作空间中的关键值.我的格式有误吗？ 无论我如何设置它，它都会继续给我一个错误CS0266.

完全错误:

严重性代码说明项目文件行 suppress 状态详细信息 错误CS0266无法将类型‘System.Collections.Generic.Dictionary&lt；string，对象&gt；’隐式转换为‘System.Collections.Generic.IDictionary&lt；string，System.Collections.Generic.IDictionary&lt；string，对象&gt；’.存在显式转换(是否缺少强制转换？)277活动

第277行是:

CustomSchemas = new Dictionary<string, object>