You could use Okta to facilitate Authenticate using ADFS as the authentication source.



https://docs.servicenow.com/bundle/helsinki-servicenow-platform/page/integrate/okta/concept/c_OktaSS...


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OKTA SSO integration


Administrators can enable the Okta SSO integration to provide single sign-on access to instances through Okta.


This integration allows users to access their instance without logging in with their user credentials. Users only need to sign on to their organization's Okta service to gain access to the instance.


How the Okta integration works

Organizations using Okta for single sign-on services typically have user information stored in another user management system, such as Active Directory. The user data is shared between Okta and these services or applications so that Okta always has the most up-to-date user credentials necessary to automatically log users into their applications. Organizations using Okta might also enter user data directly into the Okta user management service.