Each 3x3 subgroup needs to contain 1-9 as well. If you look at the top-left one in that test:

1 2 3
2 3 1
3 1 2

It fails that criteria.

I'm stuck on the same test.

If I could understand why that is not a valid sudoku solution, I could fix my code accordingly.

It seems valid to me, but obviously it is not lol.

Anyone?

I am also getting the same message.