Hi Wootipong Consue (Office365),
Thank you for reaching out to the Microsoft Q&A platform.
Yes, VM quota will return after you tear down VMs in a VMSS, allowing for the creation of new VMs, as long as you have not exceeded your overall quota limits.
It takes some time for the quota to updated. But the quota will be returned, and you'll be able to create new VMs in the VMSS.
Please refer the document link for your reference:
Design Considerations For Scale Sets
FAQ for Azure Virtual Machine Scale Sets
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Thank you.