Forgot the whole setting up of the cookie!

public/index.php

@@ -10,6 +10,9 @@ $RATELIMITED = false;
 $SUCS_LOGIN = false;
 $ISS_LOGIN = false;
 
+session_set_cookie_params(0,"/","sucs.org",true,true);
+session_name('sucs_sso_id_v1');
+
 session_start();
 $SESSIONID = session_id();