Azure VM creation fails


We are seeing the following error when trying to create vm’s.

compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=0 – Original Error: autorest/azure: Service returned an error. Status= Code=“OperationNotAllowed” Message="Operation could not be completed as it results in exceeding approved Total Regional Cores quota

“terraform output” also doesn’t show any output, even though a couple of VM’s were provisioned before encountering the above error. So, the VMs that got created before this error also don’t show up in “terraform output” though we can actually see and use them.
Also can’t see any VM’s marked ‘tainted’.

Please advise how to resolve this.