Which action is NOT possible through My Oracle Support (MOS)?

The action of solving issues related to Always Free resources in a Free Trial Account is not possible through My Oracle Support (MOS). This is because My Oracle Support is designed primarily for customers with paid Oracle Cloud services, and users with Free Trial Accounts do not have access to the same level of support resources. Free Trial Accounts are meant to allow users to explore OCI without incurring charges, but they come with limited customer service options. This restriction means that many functionalities available to paid customers—like direct support for technical issues—are not extended to users on a Free Trial.

In contrast, the other mentioned actions—adding or changing a tenancy administrator, resetting the password for the tenancy administrator, and requesting a service limit increase—are functionalities that can be performed through My Oracle Support for users who have a paid OCI subscription. These actions involve account management and service configuration, which are key aspects of ongoing support for Oracle customers.