Shopify App Cannot Load – Redirects to settings/apps with third_party_cookies error

Hi everyone,

I’m currently facing an issue where my Shopify app cannot be loaded. Instead of opening the app, it always redirects me to:

/settings/apps?oauth_error=third_party_cookies&before=&after=&tab=installed

And shows the toast: “The application can’t be loaded, check that your browser allows third-party cookies.

What I’ve tried so far:

  • Cleared cookies and cache
  • Tried different browsers (Chrome, Edge, etc.)
  • Reinstalled the app from another store
  • Verified browser settings (third-party cookies are enabled)

Environment:

  • Shopify CLI version: 3.92.1

Additional notes:

  • The issue happens consistently across different stores and browsers
  • OAuth seems to fail and redirect immediately
  • I’ve found a solution where the app was recreated using the Shopify CLI Remix template, and that resolved the issue. However, my app is built using a custom Node.js setup (not Remix), and I would strongly prefer not to migrate the entire project just to fix this issue. Refer: Keep getting redirected away from app - #5 by Jasper

Screenshot:
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