Product details action admin extension authentication

Shopify Partner
15 0 7

My application has different urls for the frontend and the backend. Both urls are subdomains of the same domain. In a product details action admin extension I am trying to make an API call to my backend with fetch(). But the Authorization header with the JWT is not being added. It does get added if I make a request to my frontend server (which is my app url).


According to the documentation ( the Authorization header should be added should be added to any of my apps subdomains.


Here is an example of my setup:


Frontend subdomain:

Backend subdomain:


In my Shopify app setup the "App URL" is and the "Allowed redirection URL(s)" is


Am I missing something or should this be working?



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