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Please try to deploy VM in West Europe. Few other customers had success in changing the region while depolying.
Looks like there are capacity issues in few regions and there were few other customers who reported similar issues and below are few of them:
https://learn.microsoft.com/en-us/answers/questions/785186/can39t-create-free-vm.html
https://learn.microsoft.com/en-us/answers/questions/789422/azure-vm-create-error.html
https://learn.microsoft.com/en-us/answers/questions/781744/vm-creation-issue.html
https://learn.microsoft.com/en-us/answers/questions/788334/no-size-selection-available-in-configuration-of-wi.html
Hope this helps.
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