Firebase page.link reported in Play console with domain failed validation, deep links not working - how to verify ownership?

Question

I am getting this error message, and don't understand what I need to do to fix. How do I verify ownership of a Firebase deep link?

Deep links not working Users will not go directly to your app from links associated with this path, but will see the app picker or be directed to the web browser. Once you have fixed these issues and published a new version, users need to update their app before the links will work. FIX DOMAIN ISSUES error 1 domain failed validation brightness_1 Fix domain issues by verifying ownership of web links associated with this path

Answer 1

Use this website to generate and test assetlinks.json

Google Digital Asset Links

Enter Your Domain and Package Name also Enter SHA-256 You will find it in the Google Play console -> Setup -> App signing

and then uploaded the file to

[Your Domain]/.well-known/assetlinks.json