It doesn't appear that Rapido 3.4 (running DW 9.9.3) has a good standard solution for handling resetting expired passwords. I set expiration in extranet security area and then set the login's ACCESSUSERPASSWORDDATE to a past date. When attempting to subsequently login to the site, I initially saw an error "your password is expired" but not direction or links to reset password. Using the Forgot Password link showed the email I an using as not valid.
Will this require a customization to solve for on the solution? Is this something that could be added to Rapido/DW?