dnsLabelPrefix must be lowercase

[Roblarson]

Need to add toLower() to the dnsLabelPrefix because you are using the resourcegroup value which does not have to be lowercase.

[m-moris]

I'm also facing the same problem and I got error message below.

The template deployment 'Microsoft.Template' is not valid according to the validation procedure. The tracking id is '23021243-113e-4a80-8bb2-7b99a85a949c'. See inner errors for details. Please see https://aka.ms/arm-deploy for usage details. (Code: InvalidTemplateDeployment) The domain name label ManagedDisk is invalid. It must conform to the following regular expression: ^[a-z][a-z0-9-]{1,61}[a-z0-9]$. (Code: InvalidDomainNameLabel)

[chagarw]

This issue is fixed now. Thanks for reporting this issue.