The feature is missing because when a client will be block by the Service Policy he will know that the service's traffic is through F5 and which PoP is answering right now for the request. It's unsecure for some customers.
You can create custom error responses on LB with Service Policies under More Options, Configure Error Response Options, and create a Response for 403.
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You can create custom error responses on LB with Service Policies under More Options, Configure Error Response Options, and create a Response for 403.