diff --git a/teams.md/docs/main/teams/app-authentication/README.md b/teams.md/docs/main/teams/app-authentication/README.mdx
similarity index 84%
rename from teams.md/docs/main/teams/app-authentication/README.md
rename to teams.md/docs/main/teams/app-authentication/README.mdx
index 44aa2a2a2..8f41e94c7 100644
--- a/teams.md/docs/main/teams/app-authentication/README.md
+++ b/teams.md/docs/main/teams/app-authentication/README.mdx
@@ -3,6 +3,8 @@ sidebar_position: 4
 summary: Set up authentication for your Teams bot using client secrets, user managed identities, or federated identity credentials
 ---
 
+import LangLink from '@site/src/components/LangLink';
+
 # App Authentication Setup
 
 Your Teams bot needs to authenticate with Azure to send messages. This involves configuring your Azure Bot Service and App Registration correctly.
@@ -19,7 +21,7 @@ Each method has different setup requirements in Azure Portal or Azure CLI.
 
 ## After Setup
 
-Once you've completed the Azure setup for your chosen authentication method, you'll need to configure your application code. See the [App Authentication configuration guide](../../teams/app-authentication/) for details on environment variables and code configuration.
+Once you've completed the Azure setup for your chosen authentication method, you'll need to configure your application code. See the <LangLink to="essentials/app-authentication">App Authentication configuration guide</LangLink> for details on environment variables and code configuration.
 
 ## Troubleshooting
 
diff --git a/teams.md/docs/main/welcome.md b/teams.md/docs/main/welcome.mdx
similarity index 86%
rename from teams.md/docs/main/welcome.md
rename to teams.md/docs/main/welcome.mdx
index 3f6fffe35..008c5933c 100644
--- a/teams.md/docs/main/welcome.md
+++ b/teams.md/docs/main/welcome.mdx
@@ -4,6 +4,8 @@ summary: Welcome guide to Teams SDK, covering the quickstart process and how to
 llms: ignore
 ---
 
+import LangLink from '@site/src/components/LangLink';
+
 # 👋 Welcome
 
 Teams SDK is a suite of packages used to develop on Microsoft Teams. Rebuilt from the ground up with improved developer experience in mind, it's never been easier to build powerful agents and applications for the hundreds of millions Microsoft Teams users.
@@ -32,7 +34,7 @@ npx @microsoft/teams.cli@latest new python quote-agent --template echo
 
 ## Overview
 
-Microsoft Teams has a robust developer ecosystem with a broad suite of capabilities, now unified via Teams SDK. Whether you are building [AI-powered agents](/typescript/in-depth-guides/ai), [message extensions](/typescript/in-depth-guides/message-extensions), embedded web applications, or Graph, Teams SDK has you covered.
+Microsoft Teams has a robust developer ecosystem with a broad suite of capabilities, now unified via Teams SDK. Whether you are building <LangLink to="in-depth-guides/ai">AI-powered agents</LangLink>, <LangLink to="in-depth-guides/message-extensions">message extensions</LangLink>, embedded web applications, or Graph, Teams SDK has you covered.
 
 ## ⭐ What's new?
 
diff --git a/teams.md/src/components/LangLink.tsx b/teams.md/src/components/LangLink.tsx
new file mode 100644
index 000000000..bce079e96
--- /dev/null
+++ b/teams.md/src/components/LangLink.tsx
@@ -0,0 +1,20 @@
+import React, { type PropsWithChildren } from 'react';
+import Link from '@docusaurus/Link';
+import { useLanguagePreference } from '../hooks/useLanguagePreference';
+
+interface LangLinkProps {
+  /** Path relative to the language root, e.g. "essentials/app-authentication" */
+  to: string;
+}
+
+/**
+ * A link component that automatically prefixes the path with the user's
+ * selected language preference.
+ *
+ * Usage: <LangLink to="essentials/app-authentication">Link text</LangLink>
+ * Renders: <a href="/typescript/essentials/app-authentication">Link text</a>
+ */
+export default function LangLink({ to, children }: PropsWithChildren<LangLinkProps>) {
+  const { language } = useLanguagePreference();
+  return <Link to={`/${language}/${to}`}>{children}</Link>;
+}
diff --git a/teams.md/src/pages/templates/essentials/app-authentication.mdx b/teams.md/src/pages/templates/essentials/app-authentication.mdx
index 26007379e..679fce980 100644
--- a/teams.md/src/pages/templates/essentials/app-authentication.mdx
+++ b/teams.md/src/pages/templates/essentials/app-authentication.mdx
@@ -2,7 +2,7 @@
 sidebar_position: 5
 title: App Authentication
 summary: Configure app authentication in your Teams SDK application using client secrets, user managed identities, or federated identity credentials
-languages: ['typescript','python']
+languages: ['typescript','python','csharp']
 ---
 
 # App Authentication
diff --git a/teams.md/static/missing-pages.json b/teams.md/static/missing-pages.json
index 80ca2e36b..a5bb6ac4f 100644
--- a/teams.md/static/missing-pages.json
+++ b/teams.md/static/missing-pages.json
@@ -1,7 +1,4 @@
 {
-  "essentials/app-authentication": [
-    "csharp"
-  ],
   "essentials/on-activity/activity-ref": [
     "csharp",
     "python"