Azure VM creation task failing

I am working on the Azure VM task that requires creating a VM with size Standard_B1s.

Link to lab: https://engineer.kodekloud.com/task?id=691b0a364aa4b86f475f829b&status=start

In my lab environment, Standard_B1s is not available in West US .

I verified this through the Azure Portal UI and attempted multiple regions.
Because the required size is unavailable, the task fails with:
“VM ‘nautilus-vm’ does not have the correct size.”