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Communication Service sms 5000 message failed to deliver

Matteo Salvalaggio 20 Reputation points
2026-05-14T03:05:44.9366667+00:00

Hello, I'm having problems with the communication services, I'm not able anymore to deliver sms messages, and I used this service as to send a 2fa code, I don't have volume, I problably send less than 50 messages a day.

The error I can see from Event Grid

"deliveryStatusDetails": "5000: Message failed to deliver, Please reach out Microsoft support team for more details",
Azure Communication Services

Answer accepted by question author

Praneeth Maddali 9,680 Reputation points Microsoft External Staff Moderator
2026-05-14T23:23:13.8533333+00:00

HI @Matteo Salvalaggio

Thanks for the update — great that SMS is working again now.

Why this happened: Error 5000 is a generic delivery failure, usually caused by temporary carrier/network issues. Since it affected all messages for ~4 hours and recovered automatically, it was a transient outage on the delivery path.

To prevent it in future:

  • Add retry logic with exponential backoff
  • Monitor delivery rates via Event Grid
  • Keep a fallback (email) ready for critical 2FA

Reference :

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

https://learn.microsoft.com/en-us/azure/communication-services/quickstarts/sms/handle-sms-events

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