Please note this is a channel-specific article only applicable to Volusion. Make sure to also check the general troubleshooting steps for despatch notifications here.
1. Make sure the respective setting is enabled in Settings > Channel integrations > Edit channel details > Order > Despatch Notes. Full details on Volusion channel configuration are available here.
2. If no tracking number is available, then Linnworks will submit "No tracking" suffixed with the order reference number.