Cannot obtain metadata WCF

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WCF

I have WCF web service hosted on the local server. The client will call F5 (load balancer) which is using https. and then will send the request to local server. the architecture is like this Client=>https(https://extranet.com/service.svc)=>http(http://localcom/service.svc). now the client got the error. "Cannot obtain Metadata from https://extranet.com/service.svc If this is a Windows (R) Communication Foundation service to which you have access, please check that you have enabled metadata publishing at the specified address"

What I have tried:

<useRequestHeadersForMetadataAddress/>