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Enable Windows Authentication in IIS for the site where the CoreOne Authentication Service according to this link: https://docs.microsoft.com/en-us/iis/configuration/system.webserver/security/authentication/windowsauthentication/
Step 6 (Optional) - Internet Explorer Settings
Usually this step is in the responsibility of the customer and should be done by him (usually through a group policy) and is only necessary for our internal systems:
Enable IWA for IE and Edge:
https://help.hcltechsw.com/domino/11.0.1/admin/secu_preparing_ie_for_adfs.html