Stuck! How to change both the local admin account password and account name for an Azure Windows VM

I recently had to change both the account name and account password for a Windows VM running in Azure. Luckily, help is at hand thanks to some PowerShell and the VM Access Virtual Machine extension. No point in re-inventing the wheel, details are in the articles below...

https://blogs.technet.microsoft.com/askpfeplat/2016/02/08/resetting-the-local-admin-name-and-password-for-azure-arm-virtual-machines-with-powershell/

https://docs.microsoft.com/en-us/powershell/module/azurerm.compute/set-azurermvmaccessextension?view=azurermps-4.2.0