Private teams can only be joined if the team owner adds someone to them.
See Also
Learn How Highlights Work • Hudl SupportGet Athletes Recruited • Hudl Classic SupportHighlighting – Learning CenterTips for using privacy settingsPublic teams are visible to everyone from the teams gallery and you can join them without getting approval from the team owner.
Change a team's privacy status
To change the privacy settings for your team from public to private (or vice versa), go to the team name and select More options 
> Edit team toward the bottom of the menu. Under Privacy, select either Public or Private.
To change a team's privacy settings, go to the desktop or web app.
