Why this jam doesn't appear in the jam browser?
Viewing post in Looking forward to the game jam
After searching I found this:
"Visibility
Your jam is only visible to you and other admins until published.
Published — Jam is visible and ready for submissions and ratings when appropriate
Unlisted — Jam will not be listed on itch.io jams page"
Could be the case? Maybe you should try change it for more people to join.