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This S3 error:  ```text AmazonS3Exception: The XML you provided was not well-formed or did not validate against our published schema (Status Code: 400; Error Code: MalformedXML) ```  indicates that the XML sent to S3 (typically as part of a multipart upload or other S3 API call) is invalid. In Airbyte-related cases, similar XML parsing errors have been observed when S3 responds with an unexpected or malformed XML payload during multipart upload initialization for the S3 destination.[\[Destination S3 upload\](<https://discuss.airbyte.io/t/113>)]  However, the knowledge sources you provided do not contain a concrete, Airbyte‑specific root cause or configuration fix for this exact `MalformedXML` error. They show related S3 issues such as:  - Invalid or missing credentials (`InvalidSecurity`, bad access keys).[\[Invalid Access Key\](<https://discuss.airbyte.io/t/1669>); \[BigQuery via GCS\](<https://discuss.airbyte.io/t/465>)] - Permission problems (`Access Denied`, `not authorized to perform s3:PutObject`).[\[Helm S3 logging\](<https://github.com/airbytehq/airbyte/issues/50979>); \[Data Lake AccessDenied\](<https://github.com/airbytehq/airbyte/issues/69087>)] - Signature problems with S3‑compatible storage (`SignatureDoesNotMatch`).[\[Nessie/Minio validation\](<https://github.com/airbytehq/airbyte/issues/56411>)] - XML parsing failures during multipart upload, but without a documented final resolution.[\[Destination S3 upload\](<https://discuss.airbyte.io/t/113>)]  Because the sources don’t document a specific remediation for `MalformedXML`, I can’t reliably say more than:  - The problem is at the S3 API/XML level (either the request body Airbyte sends or the XML S3 returns). - Similar S3 issues in Airbyte have been traced to misconfigured credentials, permissions, or S3‑compatible endpoints, not to core Airbyte logic itself.  If you’re seeing this in an Airbyte S3 destination or S3 Data Lake:  1. Double‑check credentials and IAM permissions, since many related issues were ultimately permission/credential problems.[\[Helm S3 logging\](<https://github.com/airbytehq/airbyte/issues/50979>); \[BigQuery via GCS\](<https://discuss.airbyte.io/t/465>)] 2. If you use an S3‑compatible service (MinIO, etc.), verify endpoint, region, and signature settings; similar mis‑alignments caused other S3 errors.[\[Nessie/Minio validation\](<https://github.com/airbytehq/airbyte/issues/56411>)] 3. Capture and share full Airbyte job logs in a GitHub issue or forum post so the malformed XML payload (or unexpected S3 response) can be inspected, which is how the other S3 issues were debugged.[\[Destination S3 upload\](<https://discuss.airbyte.io/t/113>)]  Beyond this, the knowledge sources do not explicitly mention a known bug or patch in Airbyte for this specific `MalformedXML` error.