Keycloak SSO Integration with SharePoint

-- If you didn't do it before, PLEASE don't apply --

I'm seeking a professional with expertise in Keycloak and SharePoint integration to help us resolve an authentication issue we're currently facing.

We are integrating Keycloak Single Sign-On (SSO) with SharePoint subscription edition for public users who are not Working with Active Directory.

Mechanisms: Upon user login to Keycloak, they will be redirected to the dashboard. After successful login, attempting to access other applications will redirect them to the homepage without prompting the login page, enabling seamless SSO functionality.

OpenID is working in the Keycloak console.

Implementation Process:
1. In SharePoint, we created an Identity Provider (IDP) and added Keycloak certificates.
2. In Keycloak, we created a new realm, a new client, and new identity providers using SAML.

Error: The primary challenge we encounter is that when attempting to log in from SharePoint using Keycloak authentication, we receive an error from the realm indicating an invalid URL.