Failed verification assetlinks

Hi, there's a problem. The project uses laravel. According to the documentation I created a folder .well-known/assetlinks.json. On the path [https://***.com/.well-known/assetlinks.json](url) JSON file is opened, SHA-256 is prescribed. JSON is in this format:

`{
{ "relation": [ "delegate_permission/common.handle_all_urls",]
"target" : {
"namespace": "android_app",
"package_name": "***",
}, "sha256_cert_fingerprints": ["***"]
}
}
]`

When running the project in android studio, the urlbar is hidden and everything works as it should. But as soon as I do the APK test, then assetlinks failed. What could be the problem?
Probably off topic, but I couldn't find any information about it