Why does Ping An Insurance app prompt an error when filling in the postal code, but the code is still correct?

The reason why Ping An Insurance app prompts an error when filling in the postal code is that the postal code format is wrong. According to relevant public information, the format of postal code: China adopts a four-level six-digit coding system, with the first two representing provinces (cities and autonomous regions), the third representing postal areas, the fourth representing counties (cities) and the last two representing the location of delivery areas.