Less than a week ago, I acquired the 1-month GA Travelcard so that its first day of validity is April 22nd. I have been trying to book tickets for dates within the period of validity, but when purchasing I cannot find an option to apply the price reduction of the travelcard. I have read that I need to indicate my GA as a discount card when I am ordering my ticket, but I cannot find any specific code or words that work.
How can I book online tickets with my GA Travelcard? Is it possible that I might not be able to purchase tickets because the travelcard is not yet valid (even though the dates are within the period of validity)?
Thank you for your time.