Doesn't work for punycode domains

[alvipeo]

I get this warning first:

Could not set custom hostname 'xn--80aakbcae3au6am7h4b.xn--p1ai'. Details: Microsoft.Rest.Azure.CloudException: The name xn--80aakbcae3au6am7h4b.xn--p1ai is not valid.

and then

Exception calling "UploadFile" with "2" argument(s): "System error." At F:\path\Powershell\LetsEncrypt\WebAppFiles.ps1:28 char:35

• $webclient.UploadFile($uri, $(Get-ChildItem $File).FullName)
• CategoryInfo : NotSpecified: (:) [], MethodInvocationException
• FullyQualifiedErrorId : WebException

Get-ChildItem : Cannot find path 'F:\path\Powershell\LetsEncrypt\web.config' because it does not exist. At F:\path\Powershell\LetsEncrypt\WebAppFiles.ps1:28 char:35

• $webclient.UploadFile($uri, $(Get-ChildItem $File).FullName)

• 
  + CategoryInfo          : ObjectNotFound: (F:\path\web.config:String) [Get-ChildItem], ItemNotFoundException
  + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetChildItemCommand

Exception calling "UploadFile" with "2" argument(s): "An exception occurred during a WebClient request." At F:\path\Powershell\LetsEncrypt\WebAppFiles.ps1:28 char:35

• $webclient.UploadFile($uri, $(Get-ChildItem $File).FullName)

• 
  + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
  + FullyQualifiedErrorId : WebException

and the following at the end:

Failed to validate challenge At F:\path\Powershell\LetsEncrypt\CreateLetsEncryptWebApp.ps1:158 char:5

• throw 'Failed to validate challenge'

• 
  + CategoryInfo          : OperationStopped: (Failed to validate challenge:String) [], RuntimeException
  + FullyQualifiedErrorId : Failed to validate challenge

[hansenms]

Wasn't really tested with that. If you want to fix it, feel free to do so. Happy to accept a pull request, but it is not something I plan on working on. Sorry.