Problems with Ecommerce Bridge API ( 500 internal error)

[kate4]

I am using ecommerce API and trying to create a store following the documentation https://legacydocs.hubspot.com/docs/methods/ecomm-bridge/v2/ecommerce-bridge-overview.
But error 500 is returned. What am I doing wrong?

PUT request: https://api.hubapi.com/extensions/ecomm/v2/stores?hapikey=[myhapikey]

Body:

{
"id":1,
"label":"TestSite",
"adminUri":"https:\/\/test.com\/testsite"
}

[kate4]

Also I cannot Install ecommerce settings for my new test hubspot account using the request https://api.hubapi.com/extensions/ecomm/v1/installs?hapikey=[myhapikey].  I got the same 500 error. What's happening?