@YG-3027 ,
Thanks for reaching out to Q&A.
Each Azure region has few data centers and each data center would have few scale units. The App serivce deployment in this case refers to scale units. The new PremiumV3 pricing tier gives you faster processors, SSD storage, and quadruple the memory-to-core ratio of the existing pricing tiers (double the PremiumV2 tier). Only certain regions/scale units would support the PremiumV3 infrastructure (VM).
The supported deployment types are actually locations of the datacenters. There is a list of locations/regions that support Premiumv3 SKU. You can get the list by running the below CLI command as specified in the document,
Azure CLI:
az appservice list-locations --sku P1V3
Please note that, If your app runs in an App Service deployment where PremiumV3 isn't available, or if your app runs in a region that currently does not support PremiumV3, you need to re-deploy your app to take advantage of PremiumV3.
https://learn.microsoft.com/en-us/azure/app-service/app-service-configure-premium-tier#unsupported
I hope this helps!
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