Tracking user activity via email

Hello! Got a bit of a puzzle happening with setting up GA4 tracking on notification emails.

I’ve tried appending the tracking code to the end of keys sent via email (i.e. %{invite_link}), but Google doesn’t seem to like tracking the source, medium or campaign that I add. I used the Google Campaign URL Builder just to be sure I had everything right, but still no joy.

The resulting link looks like this: URL/invites/sQFAD7aZmE?t=NUMBERNUMBER&utm_source=forum_email&utm_medium=email&utm_campaign=forum_notifications

The traffic shows up in GA as (direct)/(none) when I look for the source/medium. Any ideas?

(I’ve tried cache clearing, using a different browser/computer, etc)