App getting a weird redirect to force_legacy_domain=1 url when opening

Topic summary

A developer migrated an external app to an embedded Shopify admin app and updated it in the partners dashboard. However, when opening the app from a store’s apps panel, it redirects to a URL containing force_legacy_domain=1, which opens in a new tab instead of embedding properly.

Key Issue:

  • The redirect suggests Shopify may still be treating the app as a legacy/old app despite the migration
  • The app functions correctly in the first tab but exhibits this redirect behavior on subsequent opens

Suggested Solution:

  • Another user experienced the identical issue and resolved it by contacting Shopify support
  • Support was able to remove the legacy app designation, after which the app worked correctly

Status: The issue appears to be on Shopify’s side and requires support intervention to update the app’s classification in their system.

Summarized with AI on November 9. AI used: claude-sonnet-4-5-20250929.

Ping support, we had the very same issue. they clicked on something and it just works. It’s a legacy app, that’s the reason

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