Hello Team,

We have observed weird and uncertain behavior while we execute any of the  below commands to proceed for the installation on Azure platform for OCP deployment 4.15.0-rc.5.

$ ./openshift-install create install-config --dir=<installation_dir> 
or
$ ./openshift-install create manifests --dir=<installation_dir> 
or 
$ ./openshift-install create cluster --dir=<installation_dir> 


Attempt 1: It fails
~~~
$ ./openshift-install create install-config --dir=. 
? SSH Public Key /root/.ssh/id_rsa.pub
? Platform azure
INFO Credentials loaded from file "/root/.azure/osServicePrincipal.json" 
? Region eastus
? Base Domain india.az.cee.support
? Cluster Name ocpdummyocp415
? Pull Secret [? for help] *******************************************************************************************************************************************************************FATAL failed to fetch Install Config: failed to generate asset "Install Config": [controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": not found in region eastus, controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": unable to determine HyperVGeneration version] 
~~~

Attempt 2 : It succeeded
~~~
./openshift-install create install-config --dir=. 
? SSH Public Key /root/.ssh/id_rsa.pub
? Platform azure
INFO Credentials loaded from file "/root/.azure/osServicePrincipal.json" 
? Region eastus
? Base Domain india.az.cee.support
? Cluster Name ocpdummyocp415
? Pull Secret [? for help] *******************************************************************************************************************************************************************INFO Install-Config created in: .     
~~~

This is very uncertain even though I have full permission and access of azure and have available disk size in all region/location as well.

~~~
$ az vm list-sizes --location  "eastus" | grep -i Standard_D8s_v3
   "name": "Standard_D8s_v3",
~~~

Attempt 3 : Fails - Now if we create manifest it fails.

~~~
./openshift-install create manifests --dir=. 
INFO Credentials loaded from file "/root/.azure/osServicePrincipal.json" 
ERROR failed to fetch Master Machines: failed to load asset "Install Config": failed to create install config: [controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": not found in region eastus, controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": unable to determine HyperVGeneration version, compute[0].platform.azure.type: Invalid value: "Standard_D4s_v3": not found in region eastus] 
~~~

Uncertain sometimes it works and sometime it does not.    

With any of the below commands we are encountering the issue:

$ ./openshift-install create install-config --dir=<installation_dir> 
or
$ ./openshift-install create manifests --dir=<installation_dir> 
or 
$ ./openshift-install create cluster --dir=<installation_dir> 

FATAL failed to fetch Install Config: failed to generate asset "Install Config": [controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": not found in region eastus, controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": unable to determine HyperVGeneration version] 

 Reverse of Expected results:

 FATAL failed to fetch Install Config: failed to generate asset "Install Config": [controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": not found in region eastus, controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": unable to determine HyperVGeneration version] 

FATAL failed to fetch Install Config: failed to generate asset "Install Config": [controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": not found in region eastus, controlPlane.platform.azure.type: Invalid value: "Standard_D8s_v3": unable to determine HyperVGeneration version] 

It should generate the install-config file or manifest or create cluster.