It seems that the link to the Campaign(operation) table is somehow
broken.If you create a new Campaign insinde a Program folder and use the
"Recurring delivery" activity, those variables should work in your final
email that you receive in your inbox (I've just tested it now). So I
would suggest to either re-create the campaign and the delivery inside
the WF, or troubleshoot the broken link: you can remove some of the
links such as using this <%= delivery.operation.id %> and see if it
works, or i...