Connect SAML2.0 to a different idp

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Hi there,
Anyone ha experience connecting SAML to other idp that is not okta,jumpcloud, entra ID or the ones listed in deel?

I am trying to connect it to casdoor, which shold be compatible because it uses saml2.0 but I have this error:

An error occurred while attempting to connect to the integration.

The SAML2 metadata url does not have the information needed