# Substack: Delayed push notifications due to OneSignal outage

- Impact (vendor’s label): major
- Status: resolved
- Started: 2024-08-04 19:08 UTC · Resolved: 2024-08-04 20:32 UTC · Duration: 1.4 h
- Updates: 2 · Affected components: Push Notifications
- [Vendor status page: https://stspg.io/yl1qm5nphyc2](https://stspg.io/yl1qm5nphyc2)
- [Company: Substack](https://rewindex.com/company/substack.md)

## Summary

Substack reported major delays to Push Notifications caused by an outage at its delivery provider, OneSignal. The incident started at 2024-08-04 19:08 UTC and was resolved at 2024-08-04 20:32 UTC, lasting 1 h 23 min. _(machine-written, sol)_
## Timeline of updates

- **identified** 2024-08-04 19:08 UTC: We've identified an issue with delays in push notifications due to an outage at our push notification delivery provider, OneSignal. We expect all notifications to be delivered as normal once the issue is resolved.
- **resolved** 2024-08-04 20:32 UTC: This incident has been resolved.

## Rewindex changes for this incident

- 2024-08-04 19:08 UTC: [Major incident: Delayed push notifications due to OneSignal outage](https://rewindex.com/change/i533e1d0bffe9a3.md)


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Canonical: https://rewindex.com/company/substack/incidents/rmn3jfnq4lcl · Markdown: https://rewindex.com/company/substack/incidents/rmn3jfnq4lcl.md · JSON: https://rewindex.com/api/v1/companies/substack/incidents/rmn3jfnq4lcl · Generated 2026-10-18T10:25:22.522Z