See
IKJ56420I Userid DACT642 not authorized to use TSO.
More accurately, you attempted to update the master catalog.There are at least two reasons why the admins will not allow this.
- You attempted to damage the system.
- You were following some sort of mindless training script.
It is the policy of the admins to shut down users that are guilty of the first bullet. The admins are under no illusion that all of the security holes have been closed; two years ago idiot users were deleting their own catalog aliases from the master catalog until the security profile that allowed this was closed. Now the assumption is you are another idiot, or you are trying to damage the system; the admins have no way to determine this, so they assume you attempted to damage the system.
The mindless training script issue, well, since the use of the system for any sort of training is prohibited, that is reason enough to kill the user.