The net::err_unknown_url_scheme error is usually triggered because of some underlying web browsing error. It can also occur if the user tries to open multiple pages of the interface.

This article discusses the "Err_unknown_URL_scheme' in Android Webview" error and gives you three solutions to fix the problem.

Use auth0 in Ionic cordova app, and when user sign in to app successfully cannot redirect to app because net: ERR_UNKNOWN_URL_SCHEME error. targetSdkVersion 29 was worked, but when upgrade to 30 get ...

When using React Developer Tools in Chrome, I encounter an error message "Unsupported URL scheme; Fallback: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME".