What does the MSG-019 Error mean?
If a message you sent is not delivered to the end device and returns a MSG-019 error code, this means that delivery of your message failed due to an unavailable or unreachable destination. Common examples are a user who is outside of cellular service or whose mobile device is powered off.
In some cases, a delivery error may occur once due to a carrier issue downstream of Sakari. To test whether the issue occurs again, you can attempt to send another message to the contact.