What can be done in case the SIngle Sign-On gateway Url is invalid?

Majority of the users could login successfully but few got the error message. The case sensitivity of the user lookup was the problem. We are utilizing ADFS that returns the mail address of the user after proper verification that looks up the user’s salesforce account through the federation id. The ambiguous thing was the mail id in AD that looked good but on keen inspection, we found that the O365 account was not syncing.

Navigating to Setup > Single Sign-On Settings you'll find a setting labelled'Make Federation ID case insensitive'.

On activating the setting, the users could properly sign in. You can check if this is the problem by choosing the button SAML assertion validator on the SIngle Sign On settings page.

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