Automated Pipeline Failing to Upsert Documents via Dust API Since August 28, 2026 Due to Data Source Write Permission...
Hello, Since August 28, 2026, our automated pipeline has been failing when calling the Dust API to upsert documents into a Folder-type data source. This was working perfectly before that date. So, we run an AWS Step Functions state machine that exports data from our PostgreSQL database and pushes it to a Dust data source via the following API call:
POST https://dust.tt/api/v1/w/{workspaceId}/spaces/{spaceId}/data_sources/{dataSourceId}/documents/{documentId}
Authorization: Bearer {adminApiKey}
Content-Type: application/json
Error received
{
"error": {
"type": "data_source_auth_error",
"message": "You are not allowed to update data in this data source."
}
}What we have verified on our end
The API key used has Admin scope and is active
The workspace ID and space ID are correct. The space is accessible via API and is an open space (isRestricted: false)
The same call tested in Postman with the same key returns the same 403 error
There is no option visible in our Dust Admin UI to grant additional write permissions to an API key on a specific data source
Has anyone experienced this issue or is aware of a change in the permission system around August 28, 2026 that could affect write access via API key on Folder-type data sources in open spaces? (our API key is correctly configured in admin mode) Thanks in advance for your support
