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

Incident Report for Nylas v3

Update

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.
Posted Jan 05, 2026 - 10:38 PST

Investigating

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.
Posted Dec 30, 2025 - 14:01 PST
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