First of all, Google Authentication v.9 (login and registration) works fine when I test on my local (Windows) laptop (the same machine that the NodeJS server is running on).

The application is almost completely finished and ready for deployment, so I want to test it on other devices as well. So, using my iPad and iPhone, I accessed ip.address:3000, where I got the page opened. But when I click on "Sign in with Google", there is no popup. Just open a blank new tab (accounts.google). Pop-ups are allowed on both devices.

Is this normal behavior? Or am I doing something wrong in my code. Then I checked again on my (local) Windows laptop and everything was fine. But I noticed an error message in the console "Cross-Origin-Opener-Policy policy will prevent the window.postMessage call.". Is this why it doesn't work on ios devices? I've been searching for hours but there doesn't seem to be a solution to this problem.

Will the same behavior occur when I deploy it on www?

I know, this is a strange question. I'm fully aware that I may have done something wrong or forgotten something. But I hope someone can help me.

edit: This is the code I run

const { handleGoogle, loading, error } = useFetch('http://192.168.0.999:8800/login');


useEffect(() => {
    /* global google */
    if (window.google) {
        google.accounts.id.initialize({
            client_id: 'xxxxxxxxxxx.apps.googleusercontent.com',
            callback: handleGoogle
        });
        google.accounts.id.renderButton(document.getElementById('loginDiv'), {
                    theme: 'outline',
                    text: 'continue with',
                    shape: 'pill',
                    //size: 'small'
        })
    }
}, [handleGoogle]);

It works fine on my local computer. But when I try it on an iPad or iPhone, there's no popup, just a blank screen. I think this should be where I can choose which Google account. Refresh this page...remain blank. Safari, Chrome show the same behavior. This is the URL of the blank tab that opens: https://accounts.google.com/gsi/xxx.apps.googleusercontent.com&ux_mode=popup&ui_mode=card&asxxxxxxxxxxx192.168.0.999:3000