Dynamic link returning empty JSON string from Firebase

Question

I'm setting up my Android app to support email authentication and as part of the task I need to create a dynamic link, which I did in the Firebase console. However, when I tested the link (https://chiaramail.page.link/.well-known/assetlinks.json, I just got back empty data ("[]"). Is there something else that needs to happen?

Answer 1

I had the same issue. Actually it is because, you need to provide SHA256 instead of SAH1 to implement dynamic link to your project. I tried to add it with my existing project through project settings. But it didn't work for me.

Then I created a new project and in the sdk configuration I skipped SHA1 input and after completing sdk setup, I went to the project setting and added SHA256. then I tried link <your dynamic link>/.well-known/assetlinks.json .It worked.

Thanks Mate.

Answer 2

You don't have to create a new project for fixing this issue.

if the /.well-known/assetlinks.json return [], the empty array you need to add SHA256 Key to your firebase project. Follow this video for more info

solution:

1. Delete the existing deeplink URL prefix
2. Add SHA256
3. Create a new deeplink

finally check the new deeplink <NEW_LINK>/.well-known/assetlinks.json It will give something like this

[{"relation":["delegate_permission/common.handle_all_urls"],"target":{"namespace":"android_app","package_name":"com.test.app","sha256_cert_fingerprints":["sha"]}}]

that means it works properly.

Answer 3

For me, no need to create a new project. Just go to Project Setting, add SHA-256, and wait about 15-20 minute to it can up-to-date on assetlinks.json site.

• Another faster option without waiting:

1. Add SHA256 on Project Settings
2. Click on Add URL prefix from menu dropdown on Dynamic Links page
3. Setup new link

Answer 4

If you have already set up the dynamic link, no need to create a new dynamic link to fix this. Just add the SHA256 in the project settings.

Note: If your releases are signed by Google Play, then go to the play console, open the app. On the left side menu, go to Setup -> App integrity -> App signing. Under App signing key certificate, copy SHA-256 certificate fingerprint and paste it in the firebase console -> project settings for Android.

For more details or any other issue, go to the link https://<your dynamic link>?d=1. (?d=1 is important, it is to debug the flow of your dynamic link) If there is an issue, it will show you a warning like The dynamic link has a warning.

Expand the warning and it shall show you what is wrong and how to fix it.