So what do we do when we click "Re-Add All Lineups" and it displays the error message:
Re-add no longer supported
You open a lineup trouble ticket to resolve the problem.
Tribune's DataDirect service had a problem where a customized lineup was not being refreshed when they made changes to the master lineup. "Re-Add" lineups captured your disabled channels, deleted the lineup, readded it, and then re-applied your disabled channels all in an attempt to get around that bug. It didn't always work.
Now that we no longer use Tribune's DD service, the reason for doing the re-add is gone. The new SD-DD service only stores a list of excluded stations, so it's always in sync with the main lineup.
Maybe instead of "no longer supported" it should say "no longer needed".