Create large number of Linux machines failed with provisioning state `Canceled` - bash

Question

I'm trying to deploy large number of linux machines using the azure-cli (v 2.0.7) using this bash script:
#!/usr/bin/env bash
number_of_servers=12
for i in `seq 1 1 ${number_of_servers}`;
do
az vm create --resource-group Automationsystem --name VM${i} --image BaseImage --admin-username azureuser --size Standard_F4S --ssh-key-value ~/.ssh/mykey.pub &
done
The machines are created from a custom image.
When I ran it I got the following error :
The resource operation completed with terminal provisioning state 'Canceled'.The operation has been preempted by a more recent operation
I tried to create less machines but the error still exists.
I looked at this question but it does not solved my problem.

Answer 1

can I create the machines from custom image?
Yes, we can use custom image to create Azure VMss.
We can use this template to deploy create vmss with custom image.
"sourceImageVhdUri": {
"type": "string",
"metadata": {
"description": "The source of the blob containing the custom image, must be in the same region of the deployment."
}
},
We should store image to Azure storage account first.