目前，Active Geo-复制在托管实例中不可用.

您可以使用复制，但仍在公共预览中

当前，所有托管实例功能中的大多数都处于公共预览状态.您需要等待一段时间才能使这些功能正式发布.因此，建议您等待一些新功能正式发布.

Currently, most of all the Managed Instance features were in public preview You need to wait for sometime to get those features were officially released. So I'd recommend waiting for some new features to get officially released.

更新1

最近，Microsoft宣布了"Azure SQL数据库托管实例，通用层"的通用可用性