App Clip Not Available In Your country or region

Develop Enviroment:

• iPhoneSE 14.0 beat6

• XCode12.0 beta6

• China Apple Developer Account

• TestFlight Review App Contains App Clip

I config a local Experiences to show card .

Then Go testflight to open a test clip .

Now I want try look my testflight app clip thought a Clip Card.

But In my website can't show meta util I remove all clips,

After I remove my all clips and then In apple developer app clip testing clear experience cache . Then return website , I can se a meta like this

Code Block 
CLip title here
open in the (null) app clip.                OPEN

I click OPEN button, show me a card ,that desc is This app clip is not currently available in your country or region

I just want test my App Clip Card . This actions can use in beat5 . I'm very confuse in this app clip develop process