Login_hint not passed to ADFS SSO configured via SAML

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@lihua.zhang 's article Pass login_hint to SAML provider - Auth0 Community mentions that this works only with Identifier First set as the Authentication Profile.

Identifier First does not work with custom login page.
The passing of login_hint or any other parameter to SSO configured via SAML should be made easier than putting such restrictions of specific use only (especially for some common parameters like login_hint)

My login url configured in SAML connection if appended with ?login_hint=abc@xyz.com (when used externally) works just as expected. This makes it clear that auth0 is not forwarding this parameter to the adfs sso during login.

Has anyone found a way to workaround this? @Auth0, any plans to make this work?

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Hi there,

Thank you for reaching out to us!

We are trying to reply and provide some information to older posts, in case others encounter the same situation and find it useful.

Based on what I was able to find, we currently do not support sending the login_hint as a query parameter in a SAML Connection, at the moment it is being encoded and passed through the SAMLRequest parameter.

I do encourage to post on our https://auth0.com/feedback page on this matter, as it is being monitored by our Product team and others can vote, if they would also want to see this as a potential feature.

Have a great one!
Gerald