Network Request Failure when signing in

If you have any sort of ad blocker or other security extension in Safari on your Mac, try turning that off. Also, make sure that Safari is set to accept all cookies and that you have "Prevent cross-site tracking" turned off. And if you have any sort of antivirus, VPN or firewall on the Mac, try disabling that.

If none of that helps, try a different web browser and see if you get different results. That would at least identify whether the issue is with your Mac or only with Safari.

Regards.

That may well be an issue with that site, if it's only one that's failing. But if you can tell us what web browser you're using and if possible what the site is, we may be able to offer suggestions.

Regards.