The Documentation doesn't include all the necessary steps to configure the Policy: https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.8/html-single/administering_the_api_gateway/index#tls-termination

The following items are missing:

1. OpenShift level configuration for the APICAST_HTTPS_PORT Environment Variable, in addition to the configuration of the Service and Routes.
2. Mention that APIcast "self-managed" needs to be used instead of "3scale managed".

Please refer to the Knowledge Base Article (KCS) linked to this Jira for more information.