Like this?
Seems to work OK.
Whatever format you’re using isn’t what Discourse prefers. Looks like some BBCode abomination learned someplace (or sometime) else.
Here’s what the “link” button in the editor inserts:
[Like this?](https://boards.straightdope.com/t/can-trackers-be-attached-to-a-device/1031503)
That said, there’s nothing wrong with just pasting the URL directly in: Can trackers be attached to a device?
If you post the url on its own line, it gets a nice preview, which is always appreciated here.