Enable RDS role on Azure VM without network and domain.

Hello, Question to you today is :
Is it possible to enable RDS role ( more then 2 available sessions needed )  on Azure virtual machine which is not joined to domain and do not have a internal network connection ? We have our TS license server but as I wrote this machine is without domain. I see option in settings/configuration :
Would you like to use an existing Windows Server license ?
but I'm not sure if this is a solution for our problem.

Do you ever had experience with case like this ?

Connection to TS license server not possible so I looking for other options.