Permalink Settings? Thank you page goes to "page not found"

Hi, I just set up Fundraising, and it went well except when I got to the Thank you page, it was a "Page Not Found" page.

I'm not sure what to do.

The permalinks settings thank you page is this:{The Fundraiser's Name}/thank-you

The "Page Not Found" page was this url:

I noticed "category" and "the fundraiser's name" aren't in there.