SMA Web service load balancing issues.

Hi,  We have configured 3 servers with the SMA web service
https://machinename1.domain.com:9090
https://machinename2.domain.com:9090
https://machinename3.domain.com:9090
We have load balanced these 3 web services using F5 load balancer and have the LB site set as https://smaws.domain.com
We used this URL with Windows Azure Pack automation endpoint and that seemed to work.
We are not sure if this is working properly or not.   
How can we test?   Should the URL to the web service contain a guid?
https://yoursmaserver:9090/00000000-0000-0000-0000-000000000000
We have tried the following but all of them produce errors.
PS C:\Users\lance_lyons> Get-SmaRunbookWorkerDeployment -WebServiceEndpoint https://smaws.domain.com
Get-SmaRunbookWorkerDeployment : Exception has been thrown by the target of an invocation.
At line:1 char:1
+ Get-SmaRunbookWorkerDeployment -WebServiceEndpoint https://smaws.domain.co ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-SmaRunbookWorkerDeployment], TargetInvocationException
    + FullyQualifiedErrorId : System.Reflection.TargetInvocationException,Microsoft.SystemCenter.ServiceManagementAuto
   mation.GetSmaRunbookWorkerDeployment
PS C:\Users\lance_lyons> Get-SmaRunbookWorkerDeployment -WebServiceEndpoint https://machinename:9090
Get-SmaRunbookWorkerDeployment : Invalid URI: Invalid port specified.
At line:1 char:1
+ Get-SmaRunbookWorkerDeployment -WebServiceEndpoint https://machinename:9090
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-SmaRunbookWorkerDeployment], UriFormatException
    + FullyQualifiedErrorId : System.UriFormatException,Microsoft.SystemCenter.ServiceManagementAutomation.GetSmaRunbo
   okWorkerDeployment
PS C:\Users\lance_lyons> Get-SmaRunbookWorkerDeployment -WebServiceEndpoint https://machinename.domain.local:9090
Get-SmaRunbookWorkerDeployment : Invalid URI: Invalid port specified.
At line:1 char:1
+ Get-SmaRunbookWorkerDeployment -WebServiceEndpoint https://machinename.domain.local: ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-SmaRunbookWorkerDeployment], UriFormatException
    + FullyQualifiedErrorId : System.UriFormatException,Microsoft.SystemCenter.ServiceManagementAutomation.GetSmaRunbo
   okWorkerDeployment
We do have the webservice configured in IIS with host header smaws.domain.com,  machinename and machinename.domain.local.
Thanks
Thanks Lance

So in this case you need to register the SMA Runbook Workers (do this on machine 1):
$webService
= "https://localhost"
$workers
= (Get-SmaRunbookWorkerDeployment
-WebServiceEndpoint
$webService).ComputerName
if($workers
-isnot [system.array]) {$workers
= @($workers)}
$workers
+= "MachineName2"
$workers += "MachineName3"
New-SmaRunbookWorkerDeployment
-WebServiceEndpoint
$webService -ComputerName
$workers

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    Gilles.

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