So my understanding is that happens because itch.io's auto-spam filter flagged the page, so it needs to be manually indexed by their team. First, double-check your game dashboard to make sure Visibility is set to Public and Classification is set to Games (instead of Tools or Assets). If those settings are already correct, you just need to head over to itch.io/support and submit a ticket asking to get your game indexed, making sure to include your game link. It can take a few days for them to review it, and sending multiple tickets actually resets your place in line.
If those two things don't sort it out, let me know!