Elevated errors for SMS opt-ins, scheduling, and sending

What to do

• Check whether you use Klaviyo Text Message Sending, WhatsApp Sending. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 33m it lasted.

  Anything that failed between 2026-07-21 20:36 UTC and 2026-07-21 21:09 UTC may need a replay.

• Subscribe to Klaviyo's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=klaviyo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Klaviyo 4

1. investigatingJul 21, 2026, 8:36 PM UTC

   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.

   provider

2. identifiedJul 21, 2026, 8:47 PM UTC

   We have identified the cause of the issue and a fix has been implemented. We are starting to see improvements in system performance.

   provider

3. monitoringJul 21, 2026, 8:57 PM UTC

   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.

   provider

4. resolvedJul 21, 2026, 9:09 PM UTC

   SMS subscriptions, SMS sending, and the creation and scheduling of SMS and WhatsApp campaigns are operating as expected. This incident has been resolved.

   provider

Corrections

None so far.

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