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Hi,
Please, have a look at this post for potential causes of such error when sending SMS: https://repost.aws/knowledge-center/sns-unknown-error-phone-sms
Best,
Didier
0
Do you use JSON format message? In this case, the message body should be a well-formatted JSON, otherwise the message body will be invalid.
answered 7 months ago
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Yes. It is using Amazon SDK API to send message. As I said, some messgaes are being delived and many messages are giving this error. If message body will be improper than it might happen for all the messages.
Have you logged the message body for each message before you sent? e.g.,
You might notice incorrect message body for some of the message.