# Smartsheet: Major incident: Investigating errors using Login with Microsoft

**Summary:** Smartsheet reported a major incident affecting Login with Microsoft and Single Sign On ( Company Credentials ), starting 2025-10-29 16:56 UTC and resolved 2025-10-30 01:24 UTC, lasting 8 h 28 min. Customers experienced authentication errors attributed to an Azure incident and a third-party authentication provider; a fix was implemented before resolution. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2025-10-29 16:56 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/vy4lpw3xg0v3](https://stspg.io/vy4lpw3xg0v3)
- [Company: Smartsheet](https://rewindex.com/company/smartsheet.md)
- Versions: before (none: first archived) → after incident\_version:113/t99rkm17bw96@e425b2791ea7
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Investigating errors using Login with Microsoft
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ postmortem
```

**4. Added: Start time**

```diff
+ 2025-10-29 16:56 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-10-30 01:24 UTC
```

**6. Added: Affected components**

```diff
+ Core Application - Single Sign On ( Company Credentials ), Single Sign On ( Company Credentials )
```

**7. Added: Update** (investigating) · 2025-10-29 16:56 UTC

```diff
+ We are currently investigating some customer reports of an Authentication error with Microsoft due to an active Azure incident (https://azure.status.microsoft/en-us/status).
```

**8. Added: Update** (identified) · 2025-10-29 19:58 UTC

```diff
+ Azure has identified the issue and is working on a resolution (https://azure.status.microsoft/en-us/status).
```

**9. Added: Update** (monitoring) · 2025-10-29 23:22 UTC

```diff
+ A fix has been implemented and we are monitoring the results.
```

**10. Added: Update** (resolved) · 2025-10-30 01:24 UTC

```diff
+ This incident has been resolved.
```

**11. Added: Update** (postmortem) · 2025-11-18 20:51 UTC

```diff
+ Beginning on October 29th, 2025, from 8:41AM PDT, users experienced Azure/Microsoft login issues. The issue occurred due to a 3rd party authentication service provider. This was resolved by 5:05PM PDT.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-10-29 16:56 UTC | Major incident: Investigating errors using Login with Microsoft (this change) | outage |

All Smartsheet changes: [timeline](https://rewindex.com/company/smartsheet/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/i7c1632ae5b3f70 · Markdown: https://rewindex.com/change/i7c1632ae5b3f70.md · JSON: https://rewindex.com/api/v1/changes/i7c1632ae5b3f70 · Generated 2026-10-18T02:31:40.334Z