Maybe you read my post about migrating a VM to Azure with the MVMC 2.0 and after successfully migrated my VHD to Azure IaaS I wanted to set my VM to the right key and in Azure that is Microsoft KMS..

I do not know if it is supported to do this but here is how it is done,

The VM I used MVMC to move was a EVAL version,

 

So the first step was to use Dism to set the version and a KMS license Key

And then after reboot I first got this message

 but after that I checked slmgr and it reported correctly KMS and activation

Good luck in your migration to the Cloud