You might struggle to join your friend in Roblox for several reasons. One reason could be that the server your friend is on is full. When a server is full, no more players can join until someone leaves.
Another reason could be that your friend is playing on a private server. Private servers require special permission to join, so you will need an invite from your friend.
Platform restrictions can also prevent you from joining. If your friend is playing on a different device, like Xbox, you might face privacy barriers set by the platform.
Sometimes, bugs and glitches can cause issues. The “Join” button might not work correctly, sending you to a random server instead. Try joining through your friend’s profile page to avoid this.
Lastly, two-factor authentication might be blocking your access. Disabling this feature can help you join your friend’s game. Ensure all these points are checked to enjoy playing together.