Hi @Aparajita_Nag 

First, try selecting a different VM size for the classic compute, as SkuNotAvailable / Capacity Restrictions usually means Azure currently has no capacity for Standard_D4ds_v5 in West India.

It is also worth checking your Azure subscription quotas under Subscriptions → Usage + quotas, filtered for West India. Check both Total Regional vCPUs and the quota for the VM family you are using (D-series). If either quota is exhausted, the cluster will not be able to provision.

If the quotas are fine, then this is most likely a regional SKU capacity issue and switching to another VM size/family is the simplest workaround.