salesforce sandbox 不支持 data export
https://help.salesforce.com/s/articleView?id=xcloud.admin_exportdata.htm&type=5
No Sandbox Support
The data export service isn’t supported in
sandboxes. You can request an export in your sandbox, but the export
doesn’t get processed and doesn’t complete. The only way to remove the
export request after it’s been queued is to refresh your sandbox.
有点无语了，难道就不需要测试导出和导入吗（例如数据迁移的情况）？