Possible error codes returned in the Chat Apps delivery receipts include:
| Error code | Possible Reason | Comments |
|---|---|---|
| 1 | AbsentSubscriber | Subscriber is not registered in this chat channel |
| 2 | ContentRelatedError | Content Type is not supported by this channel |
| 14 | InternalError | Internal error |
| 15 | InvalidDestination | UserId is not valid for that channel |
| 23 | ConnectionError | Channel connection error |
| 36 | Expired | Message expired (not delivered at requested time) |
| 41 | SmscReject | Message rejected by Chat channel |
| 42 | NoCredit | Not enough credit on Account wallet |
| 43 | SpamFilter | Message filtered by anti-spam reason (ie exceeded daily limit of allowed messages on WhatsApp channel) |
| 46 | SubscriberNotReachable | Message sent to Channel, but user is not reachable for delivery |
| 61 | SessionExpired | Message trashed by session expired reason (i.e. 24 hours for WhatsApp) |