Once you have changed your ticket template, try it again. it may not print any barcodes on your receipt just yet as it depends when you have your receipt set to print. The ticket ID is only generated AFTER the ticket is closed so if your receipt prints before the ticket closing process in samba technically the ticket ID does not yet exist so it cannot print a barcode.
We overcome this by making the receipt print AFTER the ticket has closed so that it can access the generated ticket ID and print it on the receipt. This is something that @Jesse helped me with so, ensure you have made the changes to your ticket template ans show us a screenshot, and do a test sale to see what prints on the receipt. then if we need to change how your receipts are set to print we can help with that