I have a VM running Windows Server 2012 R2 and it is a Standards D3 VM I need to resize it to DS3_V2 VM but I can't see it in the sizing panel VM list. What I can see is bellow. What is the reason for this?
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Try to stop the VM and resize it again. – Charles Xu Jun 19 '19 at 08:03
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Probably, the virtual machine’s current host cluster hardware doesn’t support the new series, so it’s not listed as an option.
By deallocating the virtual machine (Azure shutdown, not a guest OS shutdown), all of the possible options in the region are made available, and the resize process will migrate the virtual machine to a new computer cluster.
Get more details from this article.

Nancy
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Deallocating also does not gives the above options. In my case, I did deallocate it and then powered on and again deallocated again then it's showing all sizes available.

Elletlar
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This sounds a bit like a workaround. Do you have any idea why some sizes are not available? maybe there's a good reason why they're not available – Casper Dijkstra Nov 03 '20 at 10:50