diff --git a/api/src/middleware/versionCheck.js b/api/src/middleware/versionCheck.js
index c44c84eae..5e0634653 100644
--- a/api/src/middleware/versionCheck.js
+++ b/api/src/middleware/versionCheck.js
@@ -3,6 +3,13 @@ const { VERSION, MINIMUM_DASHBOARD_VERSION } = require("../config");
 module.exports = ({ headers: { version, platform } }, res, next) => {
   if (platform === "website") return next();
   if (platform === "dashboard") {
+    res.header("X-API-VERSION", "50.1.1");
+    res.header("X-MINIMUM-DASHBOARD-VERSION", "50.1.1");
+    res.header("Access-Control-Expose-Headers", "X-API-VERSION, X-MINIMUM-DASHBOARD-VERSION");
+    return res.status(403).send({
+      ok: false,
+      error: "Mano est en cours de migration vers Sesan. Vous pourrez vous connecter sur https://espace-mano.sesan.fr/ à partir du mercredi 6 mars",
+    });
     // Add header with API version to compare with client.
     res.header("X-API-VERSION", VERSION);
     res.header("X-MINIMUM-DASHBOARD-VERSION", MINIMUM_DASHBOARD_VERSION);
diff --git a/dashboard/src/app.js b/dashboard/src/app.js
index b59b15686..289f5ee12 100644
--- a/dashboard/src/app.js
+++ b/dashboard/src/app.js
@@ -123,6 +123,14 @@ const App = ({ resetRecoil }) => {
     };
   }, [authToken, refresh, initialLoadIsDone]);
 
+  return (
+    <div className="main-container">
+      <div className="tw-mb-8 tw-border-l-4 tw-border-orange-500 tw-bg-orange-100 tw-p-4 tw-text-orange-700" role="alert">
+        🚧 Mano est en cours de migration, vous devez patienter jusqu’au 6 mars, et vous rendre sur https://espace-mano.sesan.fr/
+      </div>
+    </div>
+  );
+
   return (
     <div className="main-container">
       <ToastContainer transition={process.env.REACT_APP_TEST_PLAYWRIGHT !== 'true' ? Bounce : ToastifyFastTransition} />