The slug must be unique and not coincide with the other slugs in the different post types (page, post, casino, game, and bonus) and taxonomies (category, vendor, etc.). Otherwise, the slug will not work.
1) Go to ACES – Organizations (Casinos) – Slugs.
2) Add new slugs. Save the changes.
3) Go to Settings – Permalinks and click the Save Changes button. Only after this action do new slugs start work.