Windows 11 “No Internet” Sign-In Bug: How to Fix It (KB5085516 Explained)

On March 10, 2026, Microsoft released the Patch Tuesday update KB5079473 for Windows 11 versions 24H2 and 25H2. While the update introduced new features and improvements, it also triggered a frustrating issue for many users: apps incorrectly reporting “No Internet connection” during sign-in—even when the device was clearly online.

To address this, Microsoft rolled out an emergency out-of-band patch, KB5085516, on March 21, 2026.

Quick Fix (TL;DR)

If you’re seeing a false “no Internet” error when signing into Microsoft apps:

👉 Go to Settings → Windows Update → Optional updates
👉 Install KB5085516 manually

Note: This update is optional and won’t install automatically unless you’ve enabled “Get the latest updates as soon as they’re available.”

What Went Wrong With KB5079473?

The issue introduced by KB5079473 affects how Windows detects network connectivity during Microsoft account authentication.

In certain conditions, the system falsely reports that there’s no internet connection. This incorrect status is then passed to apps relying on Microsoft account sign-in, causing them to fail.

Affected Apps Include:

• Microsoft Teams (free version)
• Microsoft OneDrive
• Microsoft Outlook
• Microsoft Word
• Microsoft Excel
• Microsoft PowerPoint
• Microsoft Copilot

Even though apps may open normally, cloud-based features break silently—such as syncing files, downloading templates, or accessing online content.

Error Codes & Symptoms

Many users report encountering:

• Error code: 0x800704cf
• Message: “You’ll need the Internet for this. It doesn’t look like you’re connected.”

Other affected components include:

• Microsoft Store
• Feedback Hub

Important:

Standard fixes do NOT work, including:

• Resetting network settings
• Changing DNS
• Running wsreset.exe
• Using a VPN

👉 That’s because the issue is inside Windows itself, not your network.

Who Is Affected?

This bug only impacts personal Microsoft account sign-ins.

✔️ Affected:

• Home users
• Personal accounts

❌ Not affected:

• Organizations using Microsoft Entra ID (formerly Azure AD)

In some cases, the issue may temporarily disappear when your network state changes—but it often returns after a reboot.

What KB5085516 Fixes

The emergency patch KB5085516 resolves the authentication bug and restores normal connectivity detection.

Updated Build Numbers:

• Windows 11 25H2: Build 26200.8039
• Windows 11 24H2: Build 26100.8039

It also includes:

• Servicing Stack Update (KB5083532)
• Updated AI components (Image Search, Content Extraction, Semantic Analysis)

👉 Microsoft reports no new known issues with this patch.

How to Install KB5085516 (Step-by-Step)

Method 1: Windows Update (Recommended)

1. Open Settings → Windows Update
2. Look under Optional updates available
3. Select KB5085516 → Download & install
4. Restart your PC

⏱️ Installation time:

• Download: ~5 minutes
• Install: ~5–7 minutes

After reboot, test sign-in in affected apps—the issue should be resolved.

Method 2: Manual Install (If Windows Update Fails)

If you encounter errors like 0x80073712, use the standalone installer:

1. Go to the Microsoft Update Catalog
2. Search for KB5085516
3. Download the correct version (x64 or ARM64)
4. Run the .msu file and follow instructions
5. Restart your system

Verify Installation:

• Go to Settings → System → About
• Check build number matches:
  • 26200.8039 (25H2)
  • 26100.8039 (24H2)

IT Admin Deployment (Enterprise)

For managed environments:

• Deploy via Microsoft Intune as an expedited update
• Use Windows Autopatch or Microsoft Graph API

Although enterprise environments using Entra ID aren’t directly affected, BYOD or hybrid setups may still require patching.

Can You Uninstall KB5085516?

Not easily.

Because the update combines:

• Servicing Stack Update (SSU)
• Latest Cumulative Update (LCU)

You cannot remove it via standard uninstall tools.

Instead, use DISM:

DISM /online /get-packages
DISM /online /Remove-Package /PackageName:[LCU_PACKAGE_NAME]

⚠️ Note:

• SSU cannot be removed
• Uninstalling updates may expose your system to security risks

Should You Install KB5085516?

✔️ Install it if:

• You’re experiencing the “no Internet” sign-in bug
• You rely on Microsoft apps with personal accounts

❌ You can wait if:

• Your system is working fine
• You prefer to install updates later

👉 The fix will likely be included in the next regular cumulative update anyway.

A Broader Trend: Update Stability Concerns

Recent updates highlight a pattern:

• January 2026: KB5074109 caused BSODs and GPU issues
• March 2026: KB5079473 introduced authentication bugs

While not catastrophic, these issues reinforce a common strategy:

👉 Wait a few days before installing major updates
👉 Monitor feedback from other users

Final Thoughts

The “no Internet” bug in Windows 11 is a perfect example of how even routine updates can introduce unexpected issues. Thankfully, KB5085516 provides a direct and reliable fix.

If you’ve been locked out of apps like Outlook, OneDrive, or Teams, installing this patch should restore full functionality in minutes.

For everyone else, it’s another reminder: update smart, not fast.