WAC 2103 Export-Connection gives error

I get an error when trying to export my server list connections - any ideas?

I have a lot of servers entered - I would feel a lot more comfortable with a backup of them...

PS C:\Users\grma> Import-Module "$env:ProgramFiles\windows admin center\PowerShell\Modules\ConnectionTools"
PS C:\Users\grma> Export-Connection "https://localhost" -fileName "WAC-connections.csv"
Invoke-WebRequest : Unable to connect to the remote server
At C:\Program Files\windows admin center\PowerShell\Modules\ConnectionTools\ConnectionTools.psm1:75 char:17
+     $response = Invoke-WebRequest @params
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebExc
   eption
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

Failed to get the connections
At C:\Program Files\windows admin center\PowerShell\Modules\ConnectionTools\ConnectionTools.psm1:77 char:9
+         throw "Failed to get the connections"
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : OperationStopped: (Failed to get the connections:String) [], RuntimeException
    + FullyQualifiedErrorId : Failed to get the connections