DTM has some built in link tracking via the Download links and outbound links. See documentation here.
If this doesn't meet your needs and you'd like to track every link, I'd recommend creating an event based rule that is fired anytime someone clicks on any <a> tag. I believe you need to at least specify which tag or selector you'd like to detect the click for in DTM. Currently you have that field blank and I'm not sure that's supported. If it were, DTM would be trying to track any click on any portion of your website.
I assume the regex you've got placed in the rule is trying to filter that out? I think there may be a simpler way but just targeting <a> tags.
I'd recommend removing the regex and adding an "a" in the tag box to see if we can get the rule to fire. Once it's firing in staging, you can add additional conditions to limit the calls to your selected focus.