I have a test setup of Windows Virtual Desktop (WVD) and was experimenting with adding an additional VM. At least, I tried to. My WVD virtual network is in the UK West region. And when I try to create a VM I get the message: Your subscription doesn’t support virtual machine creation in UK West. Choose a different location.
This was annoying because my WVD virtual network is in UK West, so no, another region would not do. If you click Learn More you get this page which says that if you get this message and still want to deploy a VM in the region, you have to raise a support case.
I am guessing but I presume this is a capacity problem and that Microsoft is discouraging VM creation in the region. The problem for the customer is that such things are opaque; there is nowhere you can see which Azure regions are running close to capacity.