Links don't work if you somehow made a mistake putting them in.
What you are mistakenly thinking of is the no-follow threshold. If a Hub author's score falls below 75 or an individual Hub's score falls below 40 then all outgoing links are marked no-follow, which means search engines are told to not follow where they go. In those instances, the links still work if visitors click on them, but search engine spiders won't follow them.
In my experience any links you place into a Hub should work at any time, even before the Hub is published and regardless of score. Providing that you have installed them in the correct manner! Whether it is 'follow' or 'no follow' is another matter entirely!
I just want to make it really clear that what Dame Scribe said about a certain score being required for links to be active is NOT true!
Links that have been correctly entered and which lead to actual pages are always active. If you make a mistake in entering the link URL, or if the page the link led to is missing or moved, that's what creates a "broken" link.
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