Well, if you've click link tracking disabled on links (or have added them incorrectly), you'd not see click activities in Marketo, but you'd still see email opens activities though!
Following are the ways that I could think of that may be causing click activities on the email links to not get logged in Marketo --
- Using tokens for links and having protocol (http:// https://) inside the token value instead of adding it outside while adding the link in an email. The email parser needs the protocol outside of the token in order to know to build the token before decorating all the links with tracking parameters. Check out this experience league product doc page
- If you're using velocity to populate the links, you should output the entire anchor tag (i.e., <a> through </a>) from the velocity token (with of course, protocol added separately in the anchor tag, and not including it as a part of a velocity variable). Tracking may also be impacted if you're using the same velocity variable to output multiple links.
- If you disable tracking via the UI in the Insert Link dialog, or include "mktNoTrack" class in the <a> tag in the HTML.