Hydrogen + Shopify Online Store on Different Domains – One Works, One 404

Technical Q&A
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Topic summary

A user on the Basic Shopify plan is running two storefronts on separate subdomains: a Liquid-based store at shop1.domain.com (working correctly with CNAME pointing to shops.myshopify.com) and a Hydrogen/React.js storefront intended for shop2.domain.com.

The Problem:

Current Status:
The user suspects the CNAME configuration for the Hydrogen storefront is incorrect or not properly connected to Oxygen hosting. They’re seeking guidance on verifying and correcting their DNS setup to resolve the 404 error. The discussion remains open with no solution provided yet.

Summarized with AI on October 30. AI used: claude-sonnet-4-5-20250929.
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I’m using the Basic Shopify plan (the lowest-tier plan).

I have set up a Shopify Online Store using a Liquid theme and successfully pointed my domain shop1.domain.com with the following DNS settings:

CNAME: shop1 → Value: shops.myshopify.com

At the same time, I’m also using a Hydrogen storefront (React.js). I want to point shop2.domain.com to my Hydrogen store, but when I visit shop2.domain.com, it shows the Oxygen 404 page. However, my Hydrogen preview link (hydrogen-theme-xxxxxxxxxxxxxxxxxxx.o2.myshopify.dev) works fine and is publicly accessible.

For shop2.domain.com, I configured the DNS as follows:

CNAME: shop2 → Value: hydrogen.shopifyapps.com
(I also tried using shops.myshopify.com for shop2, but it didn’t work.)

Currently, shop1.domain.com works fine, but shop2.domain.com is still showing a 404 error.

Has anyone else encountered this issue? I really need some advice.

1 Like
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Thank you for your response!
I’m setting up a Hydrogen storefront alongside a Liquid theme and encountering issues with Oxygen hosting, as you mentioned. It seems that the CNAME I’m using might be incorrect or not fully connected.

Could you provide more details on how to check and fix this? If needed, I can share more information about my current DNS setup.

Looking forward to your support!

Thanks