Why do you need to have a single login page? Why can't you have different login pages for SSO (really, corporate) and non-SSO (really, personal)? If you have a

Why do you need to have a single login page? Why can't you have different login pages for SSO (really, corporate) and non-SSO (really, personal)? If you have a B2B product where your customer provides an IdP for their users, then provide them with a login link that is tuned for corporate users - e.g. example.com/login/sso. On this page you have a single input box for an email address. Most corporate users will simply bookmark this page and never know that another login page exists. If you have individual users, then have another login page - say, example.com/login, with a prompt like "<Button for FB login> <Button for Google login> <Button for Apple login> <Button for Corporate login> Or, enter a username and password below: <username field> <password field>". If the user clicks <Button for Corporate login> then it takes them to example.com/login/sso. If the user has a corporate SSO but tries to fill in the password field anyway, process the login request according to the corporate IdP while throwing out whatever was in the password field.