Unable to allocate the required address spaces for the deployment in a new or predefined subnet that is contained within the specified virtual network.

When we now try to create a VM, we are getting this error:

Unable to allocate the required address spaces for the deployment in a new or predefined subnet that is contained within the specified virtual network. The long running operation tracking ID was: 0087c7768abb4e91883f786df5b0d0f2.

The Virtual Network is a simple 192.168.100.0/24, no subnets.