[US/EU] Elevated API Errors, Send Failures and Delayed Webhooks for Microsoft Grants

Update timeline

1. investigating Nov 12, 2026, 06:29 PM UTC

   We are investigating a widespread issue affecting Microsoft grants in the US and EU regions. This appears to be caused by an issue on Microsoft's side, as requests to Microsoft Graph are failing or responding slowly, and we are receiving significantly fewer change notifications from Microsoft than usual. Some customers may experience errors when sending messages, errors or slower responses on email, calendar, and contacts API requests, and webhook notifications for new or updated data arriving later than expected or not at all. Email, calendar, and contacts data may also take longer than usual to sync. Google, IMAP, and other providers are not affected. We are monitoring the situation closely and will provide additional information as it becomes available. More details here about the Microsoft outage: https://status.cloud.microsoft/

2. identified Nov 12, 2026, 06:59 PM UTC

   Microsoft has acknowledged that they have an incident regarding their systems that Nylas uses to communicate for Microsoft grants. At this time, Webhooks and Nylas API calls regarding Microsoft grants may not succeed or have significant delays. All other providers, including on-premise Exchange, are not affected. Webhooks regarding Microsoft grants that are not triggering will fire correctly once communication to the Microsoft services has been restored. We are continuing to track this incident to ensure our services will resume normal operation as soon as Microsoft has resolved their issues. Microsoft status page: https://status.cloud.microsoft/