Hello! My game is part of the bundle but I still hasn't receive an email for the bundle links to approve. The game is Gladiator's Glory.

If you go into your dashboard, then Promotions -> Co-op Bundles and then click on the two bundles, at the top there should be a purple bar that says Participant. Clicking on that should take you to the page where you can approve it, with the approve button being right at the bottom and not nearly big enough (that is my UI complaint, choose to ignore that)