CDS 2.0

CDS 2.0 is available since March 2018, but Talent does not yet support CDS 2.0. Though you can view and create CDS 2.0 databases in the PowerApps Admin center, they will not be usable in Talent. The option to use CDS 2.0 Environments in Talent deployments will be available at a later date. See https://docs.microsoft.com/en-us/dynamics365/unified-operations/talent/provisioning-talent for more info.