DC 5.6 Configure ADFS with SAML 2.0 Protocol on Windows Server 2012 R2
Configuring ADFS is already described here: Configure ADFS on Windows Server 2012 R2 - DAM v4.10.0.
Notice the following difference in configuration in the Configure URL step when adding Relying Trust:
You have to select the SAML 2 option instead of WS-Federation. The relying party SAML 2.0 SSO service URL needs to be your "https://yoursite.com"
Make certain that your site has the relying trust: "https://yoursite.com" and "https://yoursite.com/Saml2/Acs" and "https://yoursite.com/LoginService/Saml2/Acs" and https://yoursite.com/LoginService"