Which of the following actions is not supported by MikroTik in terms of user permissions?

The action identified relates specifically to MikroTik's management of user permissions and accounts. In MikroTik's User Manager, administrators can effectively manage user accounts, which includes creating users with different permission levels to suit various roles and responsibilities. This allows for a comprehensive access control system that can tailor functionalities based on user needs.

Additionally, administering user accounts includes the ability to view logs for user activities, providing a necessary oversight mechanism for tracking actions taken by users within the system. This transparency is vital for security and maintenance purposes.

Changing passwords for individual users is also a supported action. Administrators can modify user credentials to ensure security and maintain control over the network.

However, deleting the built-in administrator account is not supported due to the essential role this account plays in the overall management and functionality of the MikroTik system. This helps prevent scenarios where the system could be left without an administrator, safeguarding against total lockout situations and maintaining a secure management environment. Thus, the correct action that MikroTik does not support is the deletion of the administrator account.