Tag Link Path

I am using tags in the News Bog.
For each post, I assign the year of the posting as Category and the project it is associated with as Tag.
When clicking on the tag in front view, I get a 404 error.

I assume I am not using this option correctly - but I assumed that by clicking the tag, it would load a page that displays other posts with matching Tag?
Is this not is the purpose of displaying tags in front end view?
You can see page here:
Thank you

Replies are visible only to logged in members with an active subscription.