Users not added to List using API even after hours

I’m trying to add profiles/users to a list on Klaviyo using the v2 apis, the api returns an empty array in response when the data is valid but does not add the profiles to the list.

I have checked this thread 

 but I’m not getting the user’s details in the list as described. I have waited for almost 2 hours but still no members added to the list.

I have tried using the node-klaviyo package and simply calling the api from postman, both of them returns the same empty array response.

I have replaced sensitive values with XXXXX