What is the correct way to handle S3 bucket policy errors during BYOC recording exports?

What’s the best way to handle AccessDenied errors when the Genesys Cloud service account attempts to write bulk export files to a BYOC S3 bucket in the eu-west-2 region? The bucket policy explicitly allows s3:PutObject for the provided role ARN, yet the bulk export job fails with status FAILED and error code 1004 in v12.9. The chain of custody metadata is not being generated, which blocks our legal discovery workflow. Checking CloudTrail shows the request originates from a different IP range than expected, suggesting a potential proxy mismatch in the edge configuration.

This happens because the bucket policy missing an explicit condition for the aws:SourceVpce header when traffic routes through Genesys Cloud’s private endpoints. Check if your VPC endpoint policy also grants the necessary permissions, as the bucket policy alone isn’t enough.

This has the hallmarks of a standard IAM role assumption failure rather than just a bucket policy issue. When Genesys Cloud initiates the export, it assumes the provided role. If that role lacks the necessary sts:AssumeRole permission in its trust policy, the initial handshake fails before any S3 actions are evaluated. The AccessDenied error often masks this upstream failure.

Check the trust policy of the role ARN provided in the BYOC configuration. It must explicitly allow genesyscloud.com (or the specific account ID associated with your tenant) to assume the role. Additionally, ensure the role has a policy attached that permits s3:PutObject and s3:PutObjectAcl on the target bucket prefix.

Also, verify that the S3 bucket and the IAM role reside in the same AWS region (eu-west-2 in this case). Cross-region role assumption is not supported for BYOC exports.