Thanks for providing more details on your question @Anonymous
You can check about the availability of required size and zones using the following command:
https://learn.microsoft.com/en-us/azure/virtual-machines/linux/create-cli-availability-zone#check-vm-sku-availability
It should show you a list like :
You can validate the required size and zones availability per region and create your cluster .
Hope this answerers all of your questions and i would request you to accept the answer if this helps in solving your use case so that its useful for the entire community .
Thanks & Regards,
Pradeep