@Juan Pinera If you are just looking to create the DC on cloud for authentication purpose to remove any single point of failure if the On-prem Environment failed for some outage local datacenter/Infra. You can extend your On premises AD Domain to Azure by running a DC there which will be connected to the on -prem via VPN or Express Route.
Here is the architecture for this :
-----------------------------------------------------------------------------------------------------------------
If the suggested response helped you resolve your issue, please do not forget to accept the response as Answer and "Up-Vote" for the answer that helped you for benefit of the community.