Help to Setup Shopify Hydrogen store

Topic summary

A developer is experiencing connection issues between their Shopify Hydrogen storefront and Shopify store.

Despite completing the initial setup steps—creating a Shopify store, adding the Headless channel, configuring Hydrogen with the Storefront API token and keys—the Hydrogen mock store displays but fails to connect to the actual Shopify backend.

Setup completed:

  • Shopify store created with Headless channel
  • Hydrogen configured with Storefront API credentials
  • Using Shopify CLI version 3.76.0

Current issue:

  • Mock store runs locally but shows connection errors
  • An error screenshot was provided showing the specific failure message

The issue remains unresolved, with the developer seeking urgent assistance to establish the proper connection between Hydrogen and their Shopify store.

Summarized with AI on October 31. AI used: claude-sonnet-4-5-20250929.

I’ve created shopify store & added Headless channel then I’ve setup hydrogen & added Hydrogen storefront API token & Keys then I’ve run store then show hydrogen mock store but its not connected to my shopify. showing following error.

Please someone help me solve this asap.
Shopify CLI version: 3.76.0