Embedded app doesn't load and loops cookie warning

Shopify Apps
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Topic summary

Embedded Shopify app fails to load after moving development environment from macOS to Windows. In Chrome, the app shows a persistent warning about third-party cookies and cross-site contexts.

  • Chrome console: Warning that cookies with SameSite=None; Secure and not Partitioned are considered third‑party cookies and will be blocked in future Chrome versions. (SameSite=None allows cross-site cookies; Secure requires HTTPS; Partitioned cookies are isolated by site.)
  • Edge console: Network errors when loading monorail-edge.shopifysvc.com/v1/produce with net::ERR_BLOCKED_BY_CLIENT, followed by “Error completing request … TypeError: Failed to fetch.” This indicates the client blocked the request and the fetch failed.

Impact: The embedded app does not render and appears stuck around the cookie warning; requests required by the app are not completing.

Status: No fix or workaround identified yet; cause not determined. User is seeking guidance. Console messages and request failures are central to understanding the issue.

Summarized with AI on December 31. AI used: gpt-5.
1

Hi,

I have an application that had been working. I switched to a different computer and environment (mac → windows), and now I can’t load the application.

When I load it, it just looks the following warning (chrome):
Third-party cookie will be blocked. Learn more in the Issues tab.
Which has the following elaboration:

Cookies with the SameSite=None; Secure and not Partitioned attributes that operate in cross-site contexts are third-party cookies. In future Chrome versions, setting third-party cookies will be blocked. This behavior protects user data from cross-site tracking.

When I try to load the application from microsoft edge, I get this:
monorail-edge.shopifysvc.com/v1/produce:1
Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
3render-common-DBS16wZ0qZ_x.js:130 Uncaught Error: Error completing request. A network failure may have prevented the request from completing. Error: TypeError: Failed to fetch
at La.produce (common-DjYqfhN3KY5p.js:98:8320)

Not sure what to do. I can’t seem to find any information l

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