Issue with SharePoint 2013 Worflow Platform Configuration

I am using SharePoint 2013 Enterprise version. I have four server in the farm. From where, two are Front End Server where web application is installed and they are behind load balancing. I have other two server which act as service application server.

For example :-

1. VMSPFE01 (web application server, behind load balance)
2. VMSPFE02 (web application server, behind load balance)
3. VMSPAP01 (service application server)
4. VMSPAP02 (service application server)

My SharePoint is access on http://xyz.company.com

Now I installed Workflow Manager anc configure on server 1,2,4

1. I can see web application on IIS and pool are also running. Screen as below 

2. I can see that all services are running properly, which are

   Service Bus Gateway , Service Bus Message Broker, Windows Fabric Host Service, Workflow Manager Backend

3. I have only one issue while running below command on cmdlet, it throws error

   Register-SPWorkflowService -SPSite "http://xyz.company.com" -WorkflowHostUri"http://xyz.company.com:12291" -AllowOAuthHttp

4. My central admin service application screen shot And also I cannot see SharePoint 2013 Workflow option in the SharePoint Desinger

How can I solve the issue