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If you create an ARM VM in Azure, beware that your "Recently used size" will be ARM, and as such you will not be able to create any preconfigured x64 VMs.

Because of course if your "Recently used size" is ARM, Microsoft will disable the ability to pick an x64 size. 🤦♂️

Yes, I had to create a sacrificial x84 VM in Azure to work around this. Once my recently used size was x64, I was able to pick any size that I wanted.