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This is really a poor description of an issue :-(

I could not understand anything out of your description if the issue was not reported already. Only with the help in the other report I could guess that you speak about the same issue :-)

This is duplicate report. Please check my respond in the other thread here:

https://docs.microsoft.com/en-us/answers/idea/68199/faq-amp-help-httpsakamsmsftqahelp-page-unavailable.html

You're kidding, aren't you?

Do you like to tell me that neither you or the staff behind the Q&A site knows what an 404 HTTP error code is or means?
Or do you like to tell me, that a new site in 2020 is a acceptable piece of software, when it is not capable of checking links by itself?

It is a in broader terms a content management system. And checking links is a mandatory feature. Much more a modern CMS should not allow to delete or remove content from behind of the main UI.