If you are still seeing the issue, wanted to share that there are capacity issues in few regions and there were few other customers who reported similar issue. Below are few of those threads:
https://learn.microsoft.com/en-us/answers/questions/788334/no-size-selection-available-in-configuration-of-wi.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
Please try to deploy the VM in West Europe as few customers acknowledged that this workaround helped them in successfully deploying the VM.
Hope this helps.
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