If the systems are pointing to TMS as their manager, they will repopulate in the "list", they should get added though, just show up on the list to be added. This will do From the help:
The Automatic System Discovery Mode setting controls what is done to the detected systems:
- If the setting is enabled, systems found during the scan will be added to the folder of your choice (by default, they will be added to Discovered Systems). Default configurations may also be applied.
- If disabled, discovered systems appear on a list of systems available to Cisco TMS, but are not added. These systems can be added manually by going to Add Systems > From List.
Note that Cisco TMS interprets a system that is not in any folder as being deleted (but not purged). If you have automatic system discovery enabled, but no default folder set up for discovered systems, the systems will be treated the same as if discovery was disabled.
