Sass Basics - Getting Started with Sass - Advanced Nesting - Challenge 4 of 4

Alright, I believe something may be up with this challenge. Basically the Advanced Nesting Challange, last problem is asking me the following:

We want to add an exception for a tags that are are in the div with a class of '.footer': those links should be purple. Use the post-selector ampersand to achieve this.

This is my SCSS code:

p {
    a {
    color: red;
        .footer & {
           color: purple;
         }
  }
  > a {
    color: blue;
        &:hover {
        opacity: 0.5;
    }
  }
}

I have tested the page, and have seen the link turn purple and have even compiled it in my Prepos Sass compiler... It does exactly what is intended and asked, but even when switching my code around to a direct child of the a tag, it doesn't mark it as completed.

Am I doing something wrong here? Thank you so much! Aaron