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Please be advised that when sending SMS messages to Vietnam using Amazon SNS, you are required to use a registered sender ID as your origination identity in order to ensure deliverability, as per the requirements mentioned here.
If you do not have a registered sender ID for Vietnam, which is most likely why you are experiencing delivery issues to Vietnam destination numbers. To ensure deliverability, I recommend that you register a Sender ID to send SMS messages to Vietnam destinations, by following the steps mentioned here, this will require you to open a separate Service limit increase case to register the sender ID.
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Thanks for your quick response.