Outage in Nylas

US & EU: Intermittent Microsoft Graph Errors Creating Calendars & Events

Minor
June 23, 2025 - Started 4 days ago
Official incident page

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Outage Details

We are seeing `ErrorInternalServerError` API errors from a small number of Microsoft grants when attempting to create new events or new calendars in the Nylas API. We have confirmed that these errors are coming from Microsoft Graph API email servers and have reached out to Microsoft to address this issue. Additionally, if you retry a failed API call to create a new calendar, a different error 409 `ErrorFolderExists` may be returned. This error is also from Microsoft Graph API. This does not appear to be affecting any on-premise Exchange (EWS) grants or other email providers.
Latest Updates ( sorted recent to last )
IDENTIFIED 4 days ago - at 06/23/2025 09:03PM

The issue remains ongoing, with no change in behavior observed. We have submitted a Severity A support ticket with Microsoft and are currently awaiting their response regarding the Graph API errors impacting a subset of calendar and event creation requests.

Our engineering team continues to monitor closely and will provide updates as soon as new information becomes available.

IDENTIFIED 4 days ago - at 06/23/2025 05:55PM

We are seeing `ErrorInternalServerError` API errors from a small number of Microsoft grants when attempting to create new events or new calendars in the Nylas API.

We have confirmed that these errors are coming from Microsoft Graph API email servers and have reached out to Microsoft to address this issue.

Additionally, if you retry a failed API call to create a new calendar, a different error 409 `ErrorFolderExists` may be returned. This error is also from Microsoft Graph API.

This does not appear to be affecting any on-premise Exchange (EWS) grants or other email providers.

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