Hi,
Does the source and target server hold the same name?
Normally, if you move from ServerA to ServerB, both names should exist in tsysasservers. And then you will have 2 tabs under the scanning targets page. The script will move the configuration from ServerA to ServerB. But the destination server gets the same name, the script will not find the old server.
If any doubt, you can contact support at support@lansweeper.com. Include the output of Gatherlogs, so the support team can look at the content of the table tsysasservers