A vmx-10 VM does not support ESXi 5.0, only 5.5 and forward. And you can't simply modify the vmx file to change that string to whatever you want. You need to upgrade your ESXi host because it's not compatible with that VM. Lastly, this is more of an Azure-related question as to what they state as their compatibility.
Thanks for re-enforcing!! I'll reach out to Azure team.