The permalink function doesn't work with 1-Click WP SEO.

Please keep in mind that in some cases, there may be conflicts with other urls on your site that have already "reserved" the url (for example, a category with the url In that case, the permalink function may not work.

Also, in order for this function to work, please make sure your pemalink settings are set to something like: Post name: your-blog/sample-post/ or: Custom structure: /%postname%/