Auth0 and Single Sign On

hi there, I want to use Auth0 for single sign on. I have done a SAML integration and Auth0 logs say that I have logged in successfully. However, in the Knack interface, there is a red message on the screen that says " Oops! It looks like something didn’t work when signing in with Auth0. The error returned was: “Email or password incorrect”" . Does anyone know how to fix this?