If the main pages that were assigned as Affiliate Pages are not working as you expected, first check if those were set properly.
You can check how can be done on:
Those pages may show up something different or nothing even if you’ve set commons slugs, such: login/ , lost-password/, register/ . On this case WordPress may required an Update on Permalinks. Also, to avoid interacting with other scripts we recommend to set custom slugs for those pages (ex: my-lost-password, uap-login, register-page, etc).