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I have a Shopify store which is on Shopify Markets and I am using the API (https://a.klaviyo.com/api/back-in-stock-subscriptions) to control different markets subscriptions in the same domain (Example, a product is out of stock in the FR market, so if the customer subscribes only for the FR inventory and if the product is only back in the GB market, they don’t get the notification)
I have added the catalogs in the back end, the API is working really well for majority of people that tested. However SOME of the people that tested, dont manage to subscribe and get the API 400 error on console. 
I don’t understand why it would work for some people but not for others. All of them are using Google Chrome, same device, I can only imagine it is a browser settings? 
Any debbuging suggestion? 

 

@vthelamb I don’t think much has changed since the similar thread posted here that says essentially:

Klaviyo's standard "back in stock" feature does not natively support warehouse-level inventory or geo-specific notifications.