Hi,
The error message means that there is not enough resources such as vCPU, Memory, storage...etc at the time so GCE is not able to create the VM instances. GCP is aware of the issue and they will work on getting more resources within the affected zones. At this time, I cannot provide an ETA on when the issue will be resolved. I suggest to continue trying to create the instances throughout the following days within the asia-south1 region.
Sincerely,
Jason
Technical Solutions Representative
Google Cloud Platform, Montreal