code: public ServiceFuture<PreValidateEnableBackupResponseInner> validateAsync(String azureRegion, PreValidateEnableBackupRequest parameters, final ServiceCallback<PreValidateEnableBackupResponseInner> serviceCallback) {
          return ServiceFuture.fromResponse(validateWithServiceResponseAsync(azureRegion, parameters), serviceCallback);
      }
docs: It will validate followings
  1. Vault capacity
  2. VM is already protected
  3. Any VM related configuration passed in properties.
  
  @param azureRegion Azure region to hit Api
  @param parameters Enable backup validation request on Virtual Machine
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object