Firebase migrationFirebase Dynamic Links stopped working

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What broke when Dynamic Links shut down, and the fix

1. 01

   Shared and marketing links lead nowhere

   “All links served by Firebase Dynamic Links (both hosted on custom domains and page.link subdomains) will stop working and you will no longer be able to create new links.” Firebase, Dynamic Links deprecation FAQ

   Links on page.link, or on a custom domain served by Dynamic Links, no longer open the app. For links that only open an installed app, Firebase recommends App Links and Universal Links; for deferred deep links or click analytics, it names other providers such as Branch and AppsFlyer. Update every link you control.

2. 02

   Email link sign-in in the mobile app fails

   “you will need to upgrade to the latest Firebase Authentication SDKs and migrate to the new solution in order to continue using these actions” Firebase, Dynamic Links deprecation FAQ

   Email link sign-in for mobile apps used Dynamic Links to open the app. Update the Firebase Auth SDK, remove dynamicLinkDomain, and pass linkDomain in the action code settings if the project uses a custom Hosting domain; otherwise Firebase picks the default Hosting domain.

   const actionCodeSettings = {
     url: 'https://www.example.com/finishSignUp',
     handleCodeInApp: true,
     iOS: { bundleId: 'com.example.ios' },
     android: { packageName: 'com.example.android', installApp: true },
     // The domain must be configured in Firebase Hosting and owned by the project.
     linkDomain: 'custom-domain.com',
   };

3. 03

   Old app versions still call the API

   “The SDKs themselves will not cause your app to crash. Your application code must handle the changed API responses.” Firebase, Dynamic Links deprecation FAQ

   Creating short links and reading the link that opened the app now return errors or empty data. The Firebase SDKs don’t crash on this, but app code that expects link data can break or silently skip the feature. Remove the calls and ship an update.

4. 04

   The link data needs exporting

   “once the Firebase Dynamic Links service is shut down any .page.link domains will no longer be available.” Firebase, Dynamic Links deprecation FAQ

   Also check: Firebase marked domains and link metadata for deletion at the shutdown, and page.link domains can’t be kept. If you need the old link data, check what Firebase’s export guide still offers.

Checked against the vendor’s docs on November 9, 2026: Firebase: Dynamic Links deprecation FAQ; Firebase docs: Authenticate with Firebase using email link.

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• from $450App Fix TicketOne reproducible bug in an existing mobile or web app, diagnosed and fixed.See scope and start
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Related: Firebase auth/invalid-action-code · Firebase auth/unauthorized-domain · Firebase Hosting page not found · Cloud Firestore API disabled