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Outage in Klaviyo

Issue with Time Delays in Flows

Resolved Major
August 26, 2026 - Started 5 days ago - Lasted about 4 hours
Official incident page

Incident Report

Summary AI Generated

**Klaviyo experienced a 3.6-hour major incident on August 26, 2026, where profiles failed to progress past time delay actions in flows, disrupting email, SMS, push, and WhatsApp flow sending across all channels.** Campaign sending and flows without time delays were unaffected. A fix was deployed by 9:30 PM ET, the message backlog was processed, and the incident was fully resolved by 11:26 PM ET.

At 3:25 PM US/Eastern on August 26, 2026, we began experiencing an issue where some profiles are not progressing past time delay actions in flows as expected. This is affecting flow sending across all messaging channels, including email, text messaging, push, and WhatsApp. Message sending from campaigns, and flows that do not include time delay actions are not impacted. We are actively working on a fix. We will continue to provide updates as more information becomes available.

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Latest Updates ( sorted recent to last )
RESOLVED 5 days ago - at 08/27/2026 03:42AM

As of 11:26 PM US/Eastern on August 26, 2026, the repair to process affected flow messages from the window of impact has been completed, and flow sending has resumed as expected across all channels. We apologize for the disruption this caused. This incident has been resolved.

MONITORING 5 days ago - at 08/27/2026 01:51AM

As of 9:30PM US/Eastern, flows have resumed sending as expected across all affected messaging channels. We are processing the backlog of affected flow messages. A fix has been deployed and system performance is improving.

We continue to monitor closely and appreciate your patience throughout this incident.

IDENTIFIED 5 days ago - at 08/27/2026 01:15AM

Our Engineering team has identified the cause of this issue and is working to implement a fix to resolve the remaining impact on sending for flows affected by the time delay issue. Once the fix is rolled out, we will review and repair any impacted flows.

We are working to resolve this as quickly as possible and will share another update shortly.

INVESTIGATING 5 days ago - at 08/27/2026 12:09AM

At 3:25 PM US/Eastern on August 26, 2026, we began experiencing an issue where some profiles are not progressing past time delay actions in flows as expected. This is affecting flow sending across all messaging channels, including email, text messaging, push, and WhatsApp. Message sending from campaigns, and flows that do not include time delay actions are not impacted.

We are actively working on a fix. We will continue to provide updates as more information becomes available.

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