Hello @Graziano Tartari
Glad to know your experience with update management center is amazing.
Your understanding is right! Update Management is part of Azure Auto Manage which supports patching of guest Windows Servers and some Linux specific distributions on azure as per the information in the following support matrix document
It is not capable of managing SQL Server VMs. You can use other tools such as Microsoft System Center or Windows Intune to manage SQL Server VMs.
Please note that update management center is still a public preview services. As the service evolves, the product team will consider other major services like SQL as well.
Note:
- For Azure VMs, we currently support a combination of Offer, Publisher, and SKU of the VM image.
- See the list of supported OS images.
- Custom images are currently not supported.
Hope this information helps!
Please accept as answer and upvote if the above information is helpful for the benefit of the community.