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SMS 5002 error troubleshooting

Evan DiFrancesco 20 Reputation points
2026-01-21T19:16:22.55+00:00

Hello,

Im looking into not receiving an sms message when checking my delivery report i see the error below. My question, is this due to throttling, or carrier failure?

I found this link but according to it it says 5002 error is carrier doesnt support delivery reports.
https://learn.microsoft.com/en-us/answers/questions/2141015/sms-error-codes-delivery-report

ErrorCode: 5002. ErrorMessage: Message Delivery Timeout
Azure Communication Services
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  1. Praneeth Maddali 4,440 Reputation points Microsoft External Staff Moderator
    2026-01-21T21:43:13.7033333+00:00

    Hi @Evan DiFrancesco

    Thanks for reaching us and for providing the details and the specific error code (ErrorCode: 5002 - "Message Delivery Timeout"). You’re right that this isn’t related to throttling, which would have different error codes, or a complete carrier block or failure.

    This error usually indicates that the carrier doesn’t support delivery reports (DLRs). Azure Communication Services did send the message to the carrier, but since the carrier doesn’t generate delivery confirmations, there’s no status update. In most cases, the SMS was still delivered successfully to the recipient’s phone.

    User's image

    To confirm:

    • Ask the recipient if they received the message (including checking inbox, spam, or promotions).
    • Try sending a test SMS to the same number and review the delivery report in Azure.

    No action is required in Azure for this error, as not all carriers provide delivery reports.

    Reference :

    https://learn.microsoft.com/en-us/azure/communication-services/resources/troubleshooting/voice-video-calling/troubleshooting-codes?pivots=sms#sms-error-codes

     Please do not forget to click "Accept the answer” and Yes, this can be beneficial to other community members.

    If you have any other questions, let me know in the "comments" and I would be happy to help you.

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  1. Q&A Assist
    2026-01-21T19:16:31.9633333+00:00
    AI generated content. This question contains an answer created with AI from Q&A Assist. Learn more

    The SMS error code 5002 indicates that the carrier does not support delivery reports. This means that the message may have been delivered successfully, but the system is unable to confirm that delivery due to the carrier's limitations. It is not specifically related to throttling or a carrier failure, but rather a lack of support for delivery reports from the carrier's side.

    If you are not receiving the SMS message, it may be worth checking other potential issues such as the validity of the destination number or any restrictions set by the recipient's carrier.

    References:

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