On 29 April 2026, between 01:48 UTC and 08:10 UTC, the Decisions platform experienced intermittent service disruption caused by unexpected throttling of Microsoft Graph API requests. Customers saw failures and delays in features that depend on Microsoft Graph, including meeting and calendar operations, across multiple users and tenants.
The root cause was a new platform-level throttling policy rolled out by Microsoft. As part of that rollout, a small number of applications, including Decisions, were incorrectly assigned to a highly restrictive throttling category, sharply reducing the API request limits available to our application. Engineering identified the cause at 03:20 UTC and escalated to Microsoft, who acknowledged the issue at 05:47 UTC. Mitigation was implemented and rolled out by 08:10 UTC, at which point all services were restored to normal operation.
We are working with Microsoft to ensure such misclassification does not recur, expanding our monitoring to detect similar throttling anomalies earlier, and reinforcing existing safeguards to better handle platform degradation more gracefully.
Posted Apr 29, 2026 - 14:17 CEST
Monitoring
All services are restored and operational. We continue to monitor the situation.
Posted Apr 29, 2026 - 10:31 CEST
Identified
The issue has been identified, and mitigation is being rolled out. Service is starting to return for users.
Posted Apr 29, 2026 - 10:11 CEST
Investigating
Decisions is currently experiencing issues with loading data via the Microsoft Graph service, resulting in a non-functional application for majority of users.
Posted Apr 29, 2026 - 06:03 CEST
This incident affected: Decisions for Microsoft 365, Decisions mobile apps, Decisions AI, and Decisions API.