正如我在评论中提到的，你不能在mongo shell中创建create roles。你可以用这个检查特权：

db.runCommand({ connectionStatus: 1 })
{
  authInfo: {
    authenticatedUsers: [ { user: 'atlas-admin', db: 'admin' } ],
    authenticatedUserRoles: [
      { role: 'atlasAdmin', db: 'admin' },
      { role: 'backup', db: 'admin' },
      { role: 'clusterMonitor', db: 'admin' },
      { role: 'dbAdminAnyDatabase', db: 'admin' },
      { role: 'enableSharding', db: 'admin' },
      { role: 'readWriteAnyDatabase', db: 'admin' }
    ]
  },
  ok: 1,
  operationTime: Timestamp({ t: 1679383010, i: 1 })
}

db.runCommand({ connectionStatus: 1, showPrivileges: 1 }).authInfo.authenticatedUserPrivileges.filter(x => x.resource.collection == 'system.roles')
[
  {
    resource: { db: 'admin', collection: 'system.roles' },
    actions: [ 'find' ]
  }
]

如您所见，您只能选择角色。userAdmin或userAdminAnyDatabase权限未被授予。