Resolution:
After installing TRA 5.5
If you run Hawk 4.7.0 suite installer and choose Custom install, the list of Hawk components shows Agent as already installed and the others as addon components.

If Agent component is DEselected and installation continues, the Hawk Config utility will not show the Agent tab.

This is similar to the Event Service. If not selected as part of the install the tab does not appear in Hawk Config.

The solution is to re-run the Hawk 4.7.0 suite installer -> Custom Install and select only the Agent component. Once complete the Hawk Config will show the Agent tab.