Create Xero invoices and map 'Tracking'

Hello, I have setup a successful scenario to create a Xero invoice from monday.com, but whatever i try, I cannot get data from monday.com to populate a drop down in Xero called ‘Tracking’ I have created x3 formats in monday.com, Label, Text, Dropdown. and although I can choose them as a mapped item, the scenario runs successfully but the drop down is blank in Xero. Can anyone help?