无法从 Google Classroom API 检索学生详细信息

Question

我正在尝试借助我的 android 项目中的 Classroom API（Java 语言）检索给定教室的所有学生。我能够成功检索课程的课程和提交的课程，但它在异常消息中引发了一些权限错误。

我参考了官方文档来选择范围：

https://developers.google.com/classroom/guides/auth

抛出异常的代码：

ListStudentsResponse studentsResponse = mClassroomService.courses().students().list(courseId).execute();

我包含的范围：

new Scope(ClassroomScopes.CLASSROOM_COURSES_READONLY),
new Scope(ClassroomScopes.CLASSROOM_GUARDIANLINKS_STUDENTS),
new Scope(ClassroomScopes.CLASSROOM_PROFILE_EMAILS),
new Scope(ClassroomScopes.CLASSROOM_COURSEWORK_STUDENTS_READONLY),
new Scope(ClassroomScopes.CLASSROOM_PROFILE_PHOTOS)

我从异常中得到的错误信息

    403 Forbidden
    {
      "code": 403,
      "errors": [
        {
          "domain": "global",
          "message": "The caller does not have permission",
          "reason": "forbidden"
        }
      ],
      "message": "The caller does not have permission",
      "status": "PERMISSION_DENIED"
    }

定义的常量..

public static final String CLASSROOM_COURSES_READONLY = "https://www.googleapis.com/auth/classroom.courses.readonly";

public static final String CLASSROOM_GUARDIANLINKS_STUDENTS = "https://www.googleapis.com/auth/classroom.guardianlinks.students";

public static final String CLASSROOM_PROFILE_EMAILS = "https://www.googleapis.com/auth/classroom.profile.emails";

public static final String CLASSROOM_PROFILE_PHOTOS = "https://www.googleapis.com/auth/classroom.profile.photos";

public static final String CLASSROOM_COURSEWORK_STUDENTS_READONLY = "https://www.googleapis.com/auth/classroom.coursework.students.readonly";