面向将来需要此功能的任何人.它在以下时间开始工作:

For anyone in the future who needs this. It started working after:

1)启用域范围的委派 2)将用户添加为所有者的服务帐户 3)可能是最重要的**:在google admin上授予了api访问服务帐户的权限

1) enabling domain-wide delegation 2) adding user to service account as owner 3) probably most important** : went on google admin and gave api access to the service account