I have a forms experience setup on me homepage using the global mbox. I've setup click tracking but I'm not seeing the metrics aggregate in reporting. I have a backup metric that counts pageviews of the pages where the links go. So I know users are seeing these pages but the clicks aren't registering as I would expect. See below for more details.
I'm tracking clicks using the following script (there are five buttons across five image carousel slides).
// Adobe Target Tracking
document.querySelectorAll('li.glide__slide div.info a').forEach(link => {
link.addEventListener('click', event => {
adobe.target.trackEvent({
"mbox": "July2020_CarouselTest",
"params": {
"ctaClick": link.getAttribute('href')
}
});
})
});
I can see the mbox request when I use Adobe Experience Platform Debugger and click one of the elements. See the screenshot below.

In my Target activity, I've created a a conversion metric targeting the mbox mentioned above. I have a refining audience requiring a value be present in the ctaClick parameter. See below for screenshots detailing this.


As a safeguard, I've added an additional metric without the refining audience. Metrics aren't aggregating in activity reporting for this metric either.

Finally, as a third backup, I've added the pageviews where the button clicks lead to as a metric. Activity reporting is showing pageviews to these pages.
Why isn't activity reporting showing any conversions on my trackevent associated clicks?