Issues regarding dynamic descriptor

I want to customize the descriptor, so i use the dynamic descriptor API. However, it just didn't work, the description was only the existing business name

So is there something wrong with my codes? or some other things i missed? my codes are as below:

 

When i look at the transaction history of my online credit card account, the show-up records:

Could you help to see what's the root cause ?   our store ID:   monca94749