lost password link redirects to homepage

Lost password link redirects to homepage and does not reach /lost-password. I am using a gravity forms as custom login registration but have tried the same combination on a different site with no problems.

I notice the site working correctly the link is /my-account/lost-password.

However when I try to navigate to this page directly on the faulty site the page is not found...

Please could someone check for a solution please? Happy to provide admin access.

Kind Regards