diff --git a/client/coral-auth-callback/src/index.js b/client/coral-auth-callback/src/index.js
index 41a83dcd2..7bf75e825 100644
--- a/client/coral-auth-callback/src/index.js
+++ b/client/coral-auth-callback/src/index.js
@@ -3,32 +3,36 @@ import { getStaticConfiguration } from 'coral-framework/services/staticConfigura
 import { createPostMessage } from 'coral-framework/services/postMessage';
 
 document.addEventListener('DOMContentLoaded', () => {
-  try {
-    const staticConfig = getStaticConfiguration();
-    const { STATIC_ORIGIN: origin } = staticConfig;
-    const postMessage = createPostMessage(origin);
+  const staticConfig = getStaticConfiguration();
+  const { STATIC_ORIGIN: origin } = staticConfig;
+  const postMessage = createPostMessage(origin);
 
-    // Get the auth element and parse it as JSON by decoding it.
-    const auth = document.getElementById('auth');
-    const doc = document.implementation.createHTMLDocument('');
-    doc.body.innerHTML = auth.innerText;
+  // Get the auth element and parse it as JSON by decoding it.
+  const auth = document.getElementById('auth');
+  const doc = document.implementation.createHTMLDocument('');
+  doc.body.innerHTML = auth.innerText;
 
-    // Auth state is contained within the node.
-    const { err, data } = JSON.parse(doc.body.textContent);
-    if (err) {
-      // TODO: send back the error message.
-      console.error(err);
+  // Auth state is contained within the node.
+  const { err, data } = JSON.parse(doc.body.textContent);
+  if (err) {
+    const errDiv = document.createElement('div');
+    if (err.message) {
+      errDiv.innerText = `${err.name}: ${err.message}`;
     } else {
-      // The data will contain a user and a token.
-      const { user, token } = data;
-
-      // Send the state back.
-      postMessage.post(HANDLE_SUCCESSFUL_LOGIN, { user, token });
+      errDiv.innerText = JSON.stringify(err);
     }
-  } finally {
-    // Always close the window.
-    setTimeout(() => {
-      window.close();
-    }, 50);
+    document.body.appendChild(errDiv);
+    throw err;
   }
+
+  // The data will contain a user and a token.
+  const { user, token } = data;
+
+  // Send the state back.
+  postMessage.post(HANDLE_SUCCESSFUL_LOGIN, { user, token });
+
+  // Close the window when all went well.
+  setTimeout(() => {
+    window.close();
+  }, 50);
 });