Whether a service is managed or unmanaged depends on the product you purchased. Many server products are intentionally unmanaged, which means the customer is responsible for operating system maintenance, software setup, backups, and security.
If management is important to you, confirm the support scope and product terms before relying on assumptions. Managed and unmanaged services are very different in day-to-day responsibility.
When in doubt, treat the service details in your account as the source of truth.