See SAML certificate request prerequisites and the Field Mappings expected from SAML assertion section in SAML certificate requests service workflow.
Go to the Federation Settings page
Verify your IdP's metadata
On the Federation Settings page, in the Field Mapping section, verify that you've supplied the specified SAML attributes in your SAML assertation. See the Field Mappings expected from SAML assertion section in SAML certificate requests service workflow.
Set up your identity provider metadata
On the Federation Settings page, in the Your IDP's Metadata section, complete the tasks below.
Add the DigiCert service provider (SP) metadata
On the SAML Certificate Request page, in the DigiCert’s SP Metadata section, complete one of these tasks to add the DigiCert SP metadata to your IdP's metadata:
Sign in and finalize the SAML authenticated certificate requests connection
On the SAML Certificate Request page, in the SAML Certificate URL section, copy the URL and paste it into a browser. Then, use your IdP credentials to sign in and authenticate to SAML certificate requests.
If you prefer, you can use an IdP initiated login URL to sign into your SAML certificate request instead. However, you'll need to provide your SAML users with this IdP initiated URL or application.
You can now share the SAML certificate request URL and allow your non-CertCentral users to order their client certificates. Share these instructions with SAML users or send them with the SAML certificate requests URL.