You must determine the file location for Installing the Kerberos Keys on database nodes and on each Unity server (if used), and then use the location when setting of the value of the TeradataKeyTab property. See TeradataKeyTab.
The default value for the TeradataKeyTab property is /etc/teradata.keytab. Use this default location unless there is a reason to not do so. If you need to use a custom install location due to site policy requirements, you must also change the value of the TeradataKeyTab property to match the custom location.