If golfers can't see the leaderboard during play, it's usually because the organizer enabled Hide Leaderboard or the leaderboard link wasn't shared separately.
When Hide Leaderboard is checked on the Scorecard tab, the mini-leaderboard on the scorecard page is hidden until the round is completed.
Some organizers hide the leaderboard during play to build suspense for the awards ceremony or to prevent cheating. It is worth noting, as soon as a golfer submits their final scorecard on the scorecard review screen, they will be taken to the leaderboard.
The scorecard page shows a leaderboard snapshot (top 3 or match status). The full leaderboard is a separate page.
If you've embedded the leaderboard, some websites don't allow embedding and some browsers block cookies in iframes, which the leaderboard needs to show the correct information. There is little PlayThru can do to avoid this issue.