Policy Bot deployment Error in Azure cloud services(extended Support) from Visual studio

Deployment of Policy Bot sample is failing at Worker role throwing error: No such host is known

Unhandled Exception: No such host is known
at System.Net.Dns.GetAddrInfo(String name)
at System.Net.Dns.InternalGetHostByName(String hostName, Boolean includeIPv6)
at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
at Sample.PolicyRecordingBot.WorkerRole.AzureConfiguration.GetInstancePublicIpAddress(String publicFqdn) in ./Botcodeupdated\microsoft-graph\Samples\V1.0Samples\LocalMediaSamples\PolicyRecordingBot\WorkerRole\AzureConfiguration.cs:line 381
at Sample.PolicyRecordingBot.WorkerRole.AzureConfiguration.Initialize() in ./Botcodeupdated\microsoft-graph\Samples\V1.0Samples\LocalMediaSamples\PolicyRecordingBot\WorkerRole\AzureConfiguration.cs:line 230
at Sample.PolicyRecordingBot.WorkerRole.AzureConfiguration..ctor(IGraphLogger logger) in ./\Botcodeupdated\microsoft-graph\Samples\V1.0Samples\LocalMediaSamples\PolicyRecordingBot\WorkerRole\AzureConfiguration.cs:line 118
at Sample.PolicyRecordingBot.WorkerRole.WorkerRole.OnStart() in ./\Botcodeupdated\microsoft-graph\Samples\V1.0Samples\LocalMediaSamples\PolicyRecordingBot\WorkerRole\WorkerRole.cs:line 95
at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.InitializeRoleInternal(RoleType roleTypeEnum)
at Microsoft.WindowsAzure.ServiceRuntime.Implementation.Loader.RoleRuntimeBridge.

Below is the Cloud.config file settings.

A Wild card certificate is created and pointed tp the DNS name with a custom CName value xyz.domin.com and pointed to the default Azure cloud DNS name xyz..westeurope.cloudapp.azure.com
config file.txt

Start in WorkerRole/AzureConfiguration.cs at GetInstancePublicIpAddress, Initialize, and the constructor lines shown in the stack trace. Review the supplied ServiceConfiguration settings and reproduce the Policy Bot deployment from Visual Studio to trace why the configured host cannot be resolved. Done means the Worker role starts without the “No such host is known” exception.