In a blog page, the router works and redirects to the linked article. In a SingleArticle Page, however, the article category is missing in the URL and the link leads to a 404:
The url output by Articles Field is generated by Joomla itself.
So not sure why that would not work for you.
Can you give me (super) admin and (s)ftp access so I can take a look?
You can use the 'Confidential information' button in the forum editor to hide sensitive information.
I am not sure what kind of setup you have exactly.
But it appears the links there are not being output by Articles Field.
Or you have some weird caching going on.
Changing the output in the Articles Field layouts has no effect. Also changing the settings in the Articles Field itself seems to have no effect, like switching off the "Link Title" option.