Postal Code of Hong Kong as required by Fedex

Now is the year of 2021, the question of postal code for Hong Kong as required by Fedex still no answer since 2008.
But the stupid Fedex keep asking the postal code of Hong Kong, I am a Hongkonger and cannot find it to fill in my Hong Kong pickup address for shipping document to Overseas.
It's obviously Fedex keeps giving hard-time for clients all over the world.