Copy the following values:
x.509 certificate
Issuer URL
SAML 2.0 endpoint (HTTP)
Copy the following values:
x.509 certificate
Issuer URL
SAML 2.0 endpoint (HTTP)
which would result in the certificate, entityID( eg. metadataURL) and ACS which you would need to provide to Zitadel in my mind. Did you try it with this values?