How to troubleshoot SMS Error 4000 in Azure Communication Services

BI Team 20 Reputation points
2024-01-10T21:21:18.11+00:00

Hi there! I've been encountering SMS delivery failures due to Error 4000 on my Azure Communication Services account, which is caused by fraud detection. However, my regulatory documentation is approved and I conduct business in Canada with a toll-free number. Can anyone help me understand why I am still experiencing SMS delivery failure? Is there a way to fix this? Thanks for your help in advance.

Azure Communication Services
Azure Communication Services
An Azure communication platform for deploying applications across devices and platforms.
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Azure
Azure
A cloud computing platform and infrastructure for building, deploying and managing applications and services through a worldwide network of Microsoft-managed datacenters.
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  1. Grmacjon-MSFT 18,816 Reputation points
    2024-01-10T23:46:36.5466667+00:00

    Hello @BI Team We are sorry to hear you're facing this issue. is this your first time getting the 4000 error? has anything changed in your regulatory documentation after it got approved

    Here are some things you can try to troubleshoot and fix Error 4000 SMS delivery failures with Azure Communication Services:

    • Ensure you aren't exceeding the maximum number of messages allowed for your number as stated in this Azure doc.User's image
    • Try requesting a service quota increase for SMS so you can send more messages before hitting fraud detection thresholds.
    • Double check that your regulatory documentation is up-to-date and accurately reflects your business operations. Update it if needed.
    • Verify that the phone numbers you are sending SMS to are valid, opt-in numbers that expect to receive messages from you. Sending to invalid or spam-trap numbers can trigger fraud detection.

    Hope that helps.

    -Grace


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