# WorkOS: Major incident: Radar SMS challenge failures for phone numbers in mainland China (+86)

**Summary:** WorkOS reported a major Radar SMS challenge outage for mainland China (+86), preventing affected users from receiving codes or completing verification. It started at 2026-10-15 17:17 UTC and was resolved at 2026-10-15 21:51 UTC, lasting 4 h 34 min; WorkOS reported recovery after its upstream provider enabled alternate delivery routes. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-10-15 17:17 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/v5416ngwjz8m](https://stspg.io/v5416ngwjz8m)
- [Company: WorkOS](https://rewindex.com/company/workos.md)
- Versions: before (none: first archived) → after incident\_version:324/1xbhqjnc7368@d058ee0d8da6
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Radar SMS challenge failures for phone numbers in mainland China (+86)
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-10-15 17:17 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-10-15 21:51 UTC
```

**6. Added: Affected components**

```diff
+ AuthKit, Core Services - AuthKit, Dashboard, Supporting Services - Dashboard
```

**7. Added: Update** (investigating) · 2026-10-15 17:17 UTC

```diff
+ We are investigating an issue affecting Radar SMS challenge verification for phone numbers in mainland China (+86). Affected users may not receive verification codes or may encounter an error when requesting one, preventing them from completing verification. We will provide an update as more information becomes available.
```

**8. Added: Update** (monitoring) · 2026-10-15 17:55 UTC

```diff
+ We are seeing some recovery after our upstream provider has enabled alternate delivery routes. We are continuing to monitor.
```

**9. Added: Update** (resolved) · 2026-10-15 21:51 UTC

```diff
+ We've resolved the issue with Radar SMS challenge verifications to China.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-10-15 17:17 UTC | Major incident: Radar SMS challenge failures for phone numbers in mainland China (+86) (this change) | outage |

All WorkOS changes: [timeline](https://rewindex.com/company/workos/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._


---
Canonical: https://rewindex.com/change/i6a11e2ac1a6b30 · Markdown: https://rewindex.com/change/i6a11e2ac1a6b30.md · JSON: https://rewindex.com/api/v1/changes/i6a11e2ac1a6b30 · Generated 2026-10-17T23:52:10.170Z