Automatic selection is selected for the shipping service of the outbound order, but no tracking number is generated after the delivery order is submitted. Why?

The reason is that the outbound orders do not meet the conditions of the shipping automation rules set by the warehouse. These outbound orders need the warehouse to replace shipping labels (referring to the following picture).

Besides, in order to avoid such problems in the future, the warehouse needs to update the shipping automation rules. For specific setting methods, please check:

How to set up shipping services and automation rules?