How config a application to handle saml Request

hello team,
I generate a saml request in java code, like https://dev-530379.oktapreview.com/app/Talend_OIDC_Intergration/0oa1oknhlgwBequ550h8/sso/saml?SAMLRequest=xxxxxx, and I config a oidc application Talend_OIDC_Intergration with Client ID: 0oa1oknhlgwBequ550h8, but I got a 404 error when redirect from my app to okta.