Outage in Nylas

Small number of API Calls returning 400 JSON input errors for Miscrosoft...

Resolved Major

December 30, 2025 - Started 23 days ago - Lasted 14 days
Official incident page

Incident Report

We are currently investigating a rise of 400 unexpected end of JSON input for Microsoft grants. We have traced to Microsoft Graph response and we are reaching out to MS.

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Latest Updates ( sorted recent to last )

RESOLVED 9 days ago - at 01/13/2026 10:00PM

Microsoft has resolved the issue and the errors are no longer occurring.

INVESTIGATING 17 days ago - at 01/05/2026 06:38PM

We have informed Microsoft Support of this issue and they have escalated it and are investigating. They have not reported their findings to us yet.

We also have found that this issue appears to only occur for API calls to retrieve all messages or threads when using the parameters "any_email", "from", "to", "cc", "bcc", or "subject"

This issue is not affecting EWS grants. Only some Microsoft grants. It also is only affecting 0.18% of all API calls for Microsoft grants.

INVESTIGATING 23 days ago - at 12/30/2025 10:01PM

We are currently investigating a rise of 400 unexpected end of JSON input for Microsoft grants. We have traced to Microsoft Graph response and we are reaching out to MS.

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