Hi @Hòa Lê Thế ,
You can try the workaround provided in this post:
https://social.msdn.microsoft.com/Forums/azure/en-US/9476704f-e8e0-4aa9-a969-b6f43be96a85/postal-code-is-too-short-or-invalid-when-trying-to-sign-up-for-windows-azure?forum=windowsazurepurchasing
Otherwise you will have to create a support request to Microsoft:
Create an Azure support request
https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request
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, thank you!
Best regards,
Leon