Hi Samuel, and the PR seemed good.
I checked into it more, and your commits aren't from user sdg123, but are from a user with a username made up of your full name.
I think you have your local git username set as your full name. Instead, set it to sdg123, as that's likely confusing the checker.
Note, apparently, according to another user
you can skip over this one so you're not stuck. Usually this course until about Level 6 must be done in order, but keep in mind what this other user did.
Let us know if changing your local git
user.name works! Oh, and note you'll need to re-do the commits at least once this local
user.name is changed.