How can I troubleshoot Azure ARM template validation errors?

Run the following PowerShell Azure cmdlet with the tracking ID supplied:

Get-AzureRMLog -CorrelationId xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx -DetailedOutput

Make sure you're running the latest version of the CLI, we're working on bubbling up the detailed error. If that's still not catching it, let us know https://github.com/Azure/azure-xplat-cli/issues

Then if the log isn't showing you the detail, run the deployment with the -vv switch, the detailed debug output (while verbose) will have all the error messages and you can usually sift through and find the specific failure.

azure group deployment create ... --debug

Powershell:

New-AzResourceGroupDeployment ... -debug

Log into the azure portal portal.azure.com.

Open the Activity log

Find the record with Operation Name of Validate in the list of activities. It should have a red exclamation mark because it failed.

Click on it that record. Then click on the JSON tab at the bottom. Get reading and somewhere deep down in returned Json you might find an error in the statusMessage such as "The storage account named helloworld is already taken."