Set-AzureVMAccessExtension - BadRequest: Cannot downgrade resource

We've recently promoted a Azure VM to be a DC and ever since we're unable to access it via RDP.

I've tried to reenable RDP with this command

Get-AzureVM-ServiceNameservice -NameVM|Set-AzureVMAccessExtension|Update-AzureVM

But we receive the follow error

Update-AzureVM : BadRequest: Cannot downgrade resource extension reference VMAccessAgent, from version 2.0, to version 1.0.3 ,for Role: VM

Any ideas what's going wrong here or how we can gain access?

Thanks