Possible error codes returned in the Messaging 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 |
| 3 | DataMissing | The request is missing a required parameter. |
| 9 | EquipmentProtocolError | The receiver's app version is not capable of receiving business messages |
| 11 | Flooding | Too many messages sent to the recipient in a short period of time. |
| 14 | InternalError | Internal error |
| 15 | InvalidDestination | UserId is not valid for that channel or is part of blacklist on Connect |
| 18 | Invalid parameter | Invalid or missing parameters. Check that all required parameters are passed and are of the correct type. E.g Approved WhatsApp template with 3 variables, but only 2 are used in API request |
| 23 | ConnectionError | Channel connection error |
| 25 | Operation Aborted By Receiving Network Or User | Recipients mobile number is part of provider's experiment. It is intentionally undelivered by Channel E.g WhatsApp experiments. |
| 29 | PhoneRelatedError | The specified parameter value is invalid. |
| 36 | Expired | Message expired (not delivered at the 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 or per recipient) |
| 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) |