A user with the TSO Facility is receiving:
IKJ56644I No Valid TSO User ID
The IKJ56644I message is not referring to having access to the TSO facility.
The message is referring to the user not having a valid TSO Segment. There are many TSO fields that can be permitted to users and only one valid field is necessary to give the user a TSO Segment.
Some of the fields that can be permitted are: