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A software company hosts backend services within a private subnet of an Amazon Virtual Private Cloud (VPC). The company is integrating with a new external partner that requires IPv6 connectivity. The company's security team manages access through a security group configured to allow outbound traffic to all approved partner integrations. As part of the integration process, the DevOps team allocated IPv6 addresses to the backend services. They’ve also updated the security group's outbound rules to include the partner's IPv6 CIDR range. Despite these changes, the services failed to establish communication with the partner's systems, even though they continued to communicate internally without issue. What additional steps should be implemented to enable outbound connectivity?