Changes / Klaviyo / Elevated errors for SMS opt-ins, scheduling, and sending
Klaviyo: Major incident: Elevated errors for SMS opt-ins, scheduling, and sending
Summary
Klaviyo reported a major incident affecting SMS subscriptions, delaying SMS sends, and causing errors creating or scheduling SMS and WhatsApp campaigns. It started at 2026-07-21 20:36 UTC and was resolved at 2026-07-21 21:09 UTC, lasting 32 min. Klaviyo implemented a fix but did not disclose the cause.
Machine-written from the diff below (Sol; type: incident outage). Check the diff before relying on it.
What changed
Before: not present
After: Elevated errors for SMS opt-ins, scheduling, and sending
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After: major
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After: resolved
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After: 2026-07-21 20:36 UTC
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After: 2026-07-21 21:09 UTC
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After: Campaigns - Text Message Sending, Campaigns - WhatsApp Sending, Text Message Sending, WhatsApp Sending
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After: We are currently investigating an issue impacting SMS subscriptions, delays in SMS sending, and errors when creating or scheduling SMS and WhatsApp campaigns. We are working to restore normal service as quickly as possible. We will share another update as soon as we have more information.
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After: We have identified the cause of the issue and a fix has been implemented. We are starting to see improvements in system performance.
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After: System performance for SMS opt-in forms, sending, and campaign creation and scheduling remains stable. We continue to monitor closely and appreciate your patience throughout this incident.
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After: SMS subscriptions, SMS sending, and the creation and scheduling of SMS and WhatsApp campaigns are operating as expected. This incident has been resolved.
First version of this incident archived by Rewindex. View the live incident.
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: Elevated errors for SMS opt-ins, scheduling, and sending (this change) Klaviyo reported a major incident affecting SMS subscriptions, delaying SMS sends, and causing errors creating or scheduling SMS and WhatsApp campaigns. It started at 2026-07-21 20:36 UTC and was resolved at 2026-07-21 21:09 UTC, lasting 32 min. Klaviyo implemented a fix but did not disclose the cause. | Major incident |