Of all magazines and journals I have come across, Nature is one where paying for a subscription is actually worth it if you have an interest in science. Many magazines (e.g. The Economist) charge £20/month for a single publication; with nature you get access to their whole library of peer-reviewed articles for around the same price.

People here are against online advertising (rightly so) but it's bizarre that they also complain when an organization tries to support itself with subscriptions. What do you expect them to do?

You know there are multiple reasons why a login could fail? My post was about displaying the reason to the user. Sharing what my issue was isn't going to help you.

I also mentioned how you can find out. Check the network request and look at the response. You can do this in your browser, for example, with Firefox - https://firefox-source-docs.mozilla.org/devtools-user/network_monitor/