Why can't I use Changtu's coupons? A coach ticket?

Mine can be used Last time I received a 5 yuan ticket from Nanjing to Pizhou. I checked the coupon when I bought the ticket and used it directly. Your possible problems are: first, the account number of the coupon you received is wrong. Second, you didn't check the option to try coupons. At the bottom of the page, I will show you a screenshot. If not, you can call their customer service phone directly for consultation.