add the following line to /etc/ssh/sshd_config file:
As a test have them go to the connection tab of one of the impacted AIX systems and change DSS Key Details from "Avail. System Std. Keys" to "System Specific Key" then click "Regen 2048bit" and then download the new key using "Get Open SSH" button. They'll need to add that key to the AIX system's list of authorized keys.
Then perform a test system of that AIX system from TPAM