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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>SSO error</title>
+</head>
+<body>
+    <p>Oops! Something went wrong during authentication<span id="errormsg"></span>.</p>
+    <p>
+        If you are seeing this page after clicking a link sent to you via email, make
+        sure you only click the confirmation link once, and that you open the
+        validation link in the same client you're logging in from.
+    </p>
+    <p>
+        Try logging in again from your Matrix client and if the problem persists
+        please contact the server's administrator.
+    </p>
+
+    <script type="text/javascript">
+        // Error handling to support Auth0 errors that we might get through a GET request
+        // to the validation endpoint. If an error is provided, it's either going to be
+        // located in the query string or in a query string-like URI fragment.
+        // We try to locate the error from any of these two locations, but if we can't
+        // we just don't print anything specific.
+        let searchStr = "";
+        if (window.location.search) {
+            // window.location.searchParams isn't always defined when
+            // window.location.search is, so it's more reliable to parse the latter.
+            searchStr = window.location.search;
+        } else if (window.location.hash) {
+            // Replace the # with a ? so that URLSearchParams does the right thing and
+            // doesn't parse the first parameter incorrectly.
+            searchStr = window.location.hash.replace("#", "?");
+        }
+
+        // We might end up with no error in the URL, so we need to check if we have one
+        // to print one.
+        let errorDesc = new URLSearchParams(searchStr).get("error_description")
+        if (errorDesc) {
+
+            document.getElementById("errormsg").innerText = ` ("${errorDesc}")`;
+        }
+    </script>
+</body>
+</html>
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