Fivetran: SharePoint and Microsoft Lists connections are failing with error "Authentication failed: The client secret or certificate has expired"
Incident
Report for Fivetran
Resolved
This incident has been resolved. We have observed that instance rates are returning to normal levels and affected connectors are syncing successfully.
Incident Summary
Description:
We identified an issue for SharePoint and Microsoft Lists connections which resulted in syncs failing with a "Authentication failed: The client secret or certificate has expired" error.
Timeline:
This issue began on 2026-04-27 at 22:20:00 UTC and was resolved on 2026-04-28 at 09:30:00 UTC
Cause:
The issue occurred due to Microsoft OAuth app credentials expiration.Due to this internal workflows failed to rotate the secret keys.
Resolution:
A fix has been implemented to update these secrets.
Incident Summary
Description:
We identified an issue for SharePoint and Microsoft Lists connections which resulted in syncs failing with a "Authentication failed: The client secret or certificate has expired" error.
Timeline:
This issue began on 2026-04-27 at 22:20:00 UTC and was resolved on 2026-04-28 at 09:30:00 UTC
Cause:
The issue occurred due to Microsoft OAuth app credentials expiration.Due to this internal workflows failed to rotate the secret keys.
Resolution:
A fix has been implemented to update these secrets.
Update
We have updated all the regions with the new secret keys and will continue to monitor the connections.
Monitoring
A new secret key credential has been created to resolve the issue. Syncs are now recovering, and we are monitoring the results.
Update
Fivetran's OAuth app secret key has expired, and the team is working on creating new secret key credentials to fix the issue.
Identified
The issue has been identified and we are working to resolve it.
This incident affected: Engineering connectors (Microsoft Lists) and File connectors (SharePoint).