Fivetran: Multiple connection syncs are failing with a "Token not found" error

Incident Report for Fivetran

Resolved

Description:
We identified an issue where connections were intermittently failing with the error message: "UNAUTHENTICATED: Token not found".

Timeline:
The issue began on 2026-05-19 at 08:48 UTC and was resolved on 2026-05-19 at 09:10 UTC. During this period, customers may have experienced intermittent sync failures, with services recovering shortly afterwards.

Root Cause:
The issue was caused by failures within the scheduling layer due to an internal network disruption. This resulted in cascading failures across dependent connection services.

Resolution:
The affected connections recovered once network connectivity was restored. All services are currently operating normally.

Posted May 19, 2026 - 09:15 UTC

Identified

The issue has been identified and we are working to resolve it.

Posted May 19, 2026 - 08:50 UTC

This incident affected: Systems (General Services).