Hi @Rakesh Chand Sharma ,
Make sure you have "read" permissions assigned. For the VM creation and deletion you need:
Microsoft.Compute/virtualMachines/read
Microsoft.Compute/virtualMachines/write
Microsoft.Compute/virtualMachines/delete
For the virtual networks you need:
Microsoft.ClassicNetwork/virtualNetworks/read
Microsoft.ClassicNetwork/virtualNetworks/write
Microsoft.ClassicNetwork/virtualNetworks/delete
Alternatively, you can assign the built-in Virtual Machine Contributor role to your user, which allows the user to create and delete virtual machines.