# OneSignal: Major incident: Apple push notifications failing in about 3% of cases

**Summary:** OneSignal reported a major incident causing about 3% of Apple push notifications to fail, from 2026-08-04 17:20 UTC to 2026-08-04 19:24 UTC (2 h 4 min). The vendor attributed it to a slight change in how Apple's push notification connections work, applied a mitigation, and confirmed normal operation. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-08-04 17:20 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://status.onesignal.com/incidents/01KZ6WMQYFV0EDPQ48J7JTDMFX](https://status.onesignal.com/incidents/01KZ6WMQYFV0EDPQ48J7JTDMFX)
- [Company: OneSignal](https://rewindex.com/company/onesignal.md)
- Versions: before (none: first archived) → after incident\_version:123/01KZ6WMQYFV0EDPQ48J7JTDMFX@0ff2c671ee2a
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Apple push notifications failing in about 3% of cases
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-08-04 17:20 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-08-04 19:24 UTC
```

**6. Added: Update** (investigating) · 2026-08-04 17:20 UTC

```diff
+ What’s happening: Apple push notifications are failing in about 3% of cases. "Unknown delivery error" or "APNS failed to provide a response" error responses may be seen. Who’s affected:  • Customers using Apple Push Notifications      Current Status: We are investigating the issue and will provide an update in 20
```

**7. Added: Update** (identified) · 2026-08-04 18:45 UTC

```diff
+ We have identified the root cause and are working towards a resolution. There was a slight change in how Apple's push notification connections work. We will provide another update in 20 minutes.
```

**8. Added: Update** (monitoring) · 2026-08-04 18:46 UTC

```diff
+ We have applied a mitigation that should resolve the impact. We are monitoring to confirm effectiveness. We will provide another update in 20 minutes.
```

**9. Added: Update** (resolved) · 2026-08-04 19:24 UTC

```diff
+ The issue has been resolved. All impacted systems are now operating normally.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-08-04 17:20 UTC | Major incident: Apple push notifications failing in about 3% of cases (this change) | outage |

All OneSignal changes: [timeline](https://rewindex.com/company/onesignal/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i234e2cb652e33d · Markdown: https://rewindex.com/change/i234e2cb652e33d.md · JSON: https://rewindex.com/api/v1/changes/i234e2cb652e33d · Generated 2026-10-18T01:29:48.497Z