I have created an instant app. I uploaded it to my Google Console, and I got this error.
The www.kochchy.cz website has not been linked to your appli
So for me, and maybe this is obvious to some, was the usage of the wrong sha key. What you need to do is go to your https://play.google.com/apps/publish/ console
Go to Release Management then to the App Signing page. Copy the SHA256 key from there.
Go to https://developers.google.com/digital-asset-links/tools/generator and enter the sha key, url and packagename there.
Upload this file to https://example.com/.well-known/assetlinks.json
Make sure that the file is in the correct location: A folder named .well-known
.
Release your instant app