Hi @Naveen_Sequeira ,

If you increased quota and it didn't help then just try to use different region. In Azure, some machines are sometimes unavailable due to regional capacity issue. They should be available in another region though.
You can try with:

• East US 2 

• South Central US

You can also check which SKUs are available in a location or zone using AZ CLI:

az vm list-skus --location centralus --size Standard_D --all --output table

• --location filters output by location
• --size searches by a partial size name.
• --all shows all information and includes sizes that aren't available for the current subscription.

It should return to you following table. Pick SKU which has None in Restrictions column: