issues with Dell ECS S3 as storagelocation

[Doni7722]

Hi Community

we have issues using Dell ECS S3 as BackupStorageLocation with Velero as it says:
controller=backup error="rpc error: code = Unknown desc = error putting object backups/velero-cluster-backup-test-04-09-24/velero-cluster-backup-test-04-09-24.tar.gz: upload multipart failed, upload id: AQAAAZG9CDfvk2bPxmnhQi6DCFayA7GGyAz_QPw, cause: operation error S3: CompleteMultipartUpload, https response error StatusCode: 400, RequestID: 0a865340:18fe537c043:7db43:cb90e, HostID: , api error MalformedXML: This happens when the user sends a malformed xml (xml that doesn't conform to the published xsd) for the configuration. The error message is, \"The XML you provided was not well-formed or did not validate against our published schema.\"" logSource="pkg/controller/backup_controller.go:287"

It tells me that all Objects are backed up but on the final step it gives this error and marks the backup as failed. Do you have any idea?

Regards