I'm using same forge version, same create version and same java version as my friend but they keep getting this issue. One other friend is having the same issue but others are joining without issue.

This issue has been marked as stale because it has been inactive for 3 weeks. It will be closed if it remains inactive for another 3 weeks.

This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.

Make sure you're running forge! And that you can see create in the "mods" tab in the main menu!