The number of coupons on hand is limited. At 12, a large number of users will snap up coupons at the same time, which will lead to quick episodes, so coupons can't be grabbed. In this case, it is necessary to snap up the coupons as soon as possible after they are released to improve the success rate.

12 is the peak of the network, which leads to network instability and network delay, resulting in the inability to grab tickets in time. To ensure a good network connection, try to choose an environment with stable network signals for snapping up.