According to the inquiry of SF official website, SF coupon is an activity jointly launched by SF Express and major brands to provide users with preferential delivery service. If SF coupons are returned, it may be because of the following reasons:

1.SF coupons are limited in time and place. If you use them after the event or exceed the number of times you get them, the coupons may be invalid.

2.SF coupons have usage rules. Coupons may be cancelled if they do not meet the conditions of use or violate the rules of use.

3. SF coupons have a blacklist mechanism. If you often collect coupons but don't use them, your account may be blacked out and you can't collect or use coupons.

4. It is suggested that you read the activity instructions and usage rules carefully before using SF coupons to avoid unnecessary troubles. If you have any questions or complaints about SF coupons, you can call SF Customer Service at 95338 for consultation or feedback.