Changes / Lever / Scheduling Outage for some Microsoft Office 365 Accounts
Lever: Major incident: Scheduling Outage for some Microsoft Office 365 Accounts
Summary
Lever reported a major outage affecting Microsoft Office 365 accounts using Admin Consent, blocking interview scheduling, availability viewing and email sending. It started 2026-04-21 15:50 UTC and resolved 2026-04-22 12:07 UTC (20 h 16 min); Lever identified failed permission syncs and deployed a fix.
Machine-written from the diff below (Sol; type: incident outage). Check the diff before relying on it.
What changed
Before: not present
After: Scheduling Outage for some Microsoft Office 365 Accounts
Before: not present
After: major
Before: not present
After: postmortem
Before: not present
After: 2026-04-21 15:50 UTC
Before: not present
After: 2026-04-22 12:07 UTC
Before: not present
After: Microsoft Office 365 Email/Calendar Integration, Third-Party Workflow Dependencies - Microsoft Office 365 Email/Calendar Integration
Before: not present
After: Around 8:50am PT on 4/21/2026 we became aware of an issue where some users Microsoft Office 365 email/calendar services are unable to schedule interview events or send emails in Lever.
The impact appears to be limited to only accounts where Administrator Consent for email/calendar permissions is enabled.
Affected users are currently unable to schedule interviews or send emails in Lever and may see one or more error messages including “Could not load events” and/or “Your email/calendar integration isn't working” related to scheduling and email.
We are currently investigating this issue and will provide updates from our Engineering team as new information becomes available.
Before: not present
After: We are continuing to investigate this issue.
Before: not present
After: We have identified the issue causing failed Lever user permission syncs with Microsoft Office 365 email/calendar services for users with Administrator provided email/calendar permissions. A fix was deployed at approx. 4:39pm PT on 4/21/2026.
We are actively monitoring the fix to ensure continued email/calendar sync availability.
Before: not present
After: This incident has been resolved.
Issue: Users with Microsoft 365 calendar integrations experienced authentication failures, causing email and calendar sync to stop working. Resetting the calendar cache resulted in an endless loading state.
Impact: Affected users were unable to schedule interviews or view availability in Lever. The issue was limited to accounts using Admin Consent–based Microsoft 365 authentication.
A fix was applied at approximately 4:39 pm PDT on 4/24/2026.
An RCA will be available within 7-10 business days if applicable.
Before: not present
After: We want to share an update on a recent automation issue, including what happened, how it was resolved, and the steps we’ve taken to prevent it from happening again.
**Date/Time:** April 21, 2026, **1:40 PM – 4:39 PM PDT**
**Duration:** **2 hours 59 minutes**
### Customer Impact
During this window, customers using Microsoft Office365 were unable to retrieve interviewer availability or schedule interviews. Existing data was not lost, but new scheduling actions failed until service was restored.
### Root Cause
An internal encryption key rotation was completed for several services, but a related dependency used by the calendar service was not updated. As a result, the calendar service was unable to read newly issued Microsoft access tokens, causing scheduling requests to fail for Office365-connected accounts.
### Resolution
The calendar service was updated to use the correct dependency compatible with the new encryption keys. Once deployed, scheduling functionality was fully restored and verified in production.
### Preventative Actions
* Expand automated test coverage to explicitly validate scheduling flows for Microsoft Office365 accounts.
* Improve internal validation and service dependency checks during encryption key rotations.
First version of this incident archived by Rewindex. View the live incident (opens in new tab).
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: Scheduling Outage for some Microsoft Office 365 Accounts (this change) Lever reported a major outage affecting Microsoft Office 365 accounts using Admin Consent, blocking interview scheduling, availability viewing and email sending. It started 2026-04-21 15:50 UTC and resolved 2026-04-22 12:07 UTC (20 h 16 min); Lever identified failed permission syncs and deployed a fix. | Major incident |