2003: Attachment not found.
The attachment is not available to this account.
HTTP status: 404.
No attachment with this id is available to this account; one belonging to another account answers identically, and one already pruned no longer resolves.
Troubleshooting
Section titled “Troubleshooting”- Take attachment ids from the message or event that delivered them, in the same livemode.
- Download promptly: retained bytes are pruned on the documented retention schedule.