'Mentioned' alert not working?

Is it possible the 'someone mentions you' alert doesn't work anymore? I tagged a few people in a post I made by using the @ sign, but from later responses by them I understood they never saw my post.
 
It turns out that tagging people (in XenForo speak, a "mention") is a Premium-only feature. It's a little unfortunate that the way the forum works, it's impossible to tell the difference between a successful mention and an unsuccessful one...
 
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