How to Fix Microsoft Teams Error AADSTS70008: Security Token Expired

Encountering the frustrating Microsoft Teams Error AADSTS70008: Security Token Expired? You're not alone—this common Azure Active Directory (AAD) issue disrupts meetings, chats, and productivity. But don't worry! This guide delivers quick, reliable fixes to resolve it instantly and keep your workflow smooth. Let's dive in and reclaim your Teams experience. ✅

What is Microsoft Teams Error AADSTS70008?

The AADSTS70008 error signals that your security token has expired or become invalid. Tokens are temporary credentials Teams uses for secure authentication via Azure AD. When they lapse—often due to inactivity, network glitches, or sync issues—you're locked out until refreshed.

Key symptoms:

• Login failures with "Security token expired" message.
• Teams crashes or endless sign-in loops.
• Intermittent access to channels or calendars.

Good news: Most cases resolve with simple steps. Follow along—you'll be back online fast! 🌟

Common Causes of Security Token Expired in Teams

Step-by-Step: How to Fix Microsoft Teams Error AADSTS70008

Start with these proven methods, ordered from simplest to advanced. Test Teams after each—most users fix it by step 3! 1️⃣

1️⃣ Clear Teams Cache (Fastest Fix - 80% Success Rate)

Corrupted cache is the #1 culprit. Here's how:

1. Quit Teams completely (use Task Manager on Windows: Ctrl+Shift+Esc > End task for all Teams processes).
2. Press Win + R, type %appdata%\Microsoft\Teams, hit Enter.
3. Delete contents of these folders: Cache, blob_storage, databases, IndexedDB, Local Storage, tmp.
4. Restart Teams and sign in.

Pro tip: On Mac, go to ~/Library/Application Support/Microsoft/Teams and delete the same folders. Boom—tokens refresh! 😊

2️⃣ Re-Authenticate Your Account

Forced logout refreshes tokens:

1. In Teams, click profile > Sign out.
2. Close app, reopen, and sign in fresh.
3. If multi-account, remove others via Manage accounts.

3️⃣ Sync Your Device Clock

Time mismatches invalidate tokens:

• Windows: Settings > Time & Language > Sync now.
• Mac: System Preferences > Date & Time > Auto-set.
• Disable VPN/firewall temporarily to test.

4️⃣ Update or Reinstall Teams

Grab the latest version:

• Check Profile > Check for updates.
• Or download fresh from official site.
• Uninstall/reinstall if stubborn (back up chats first).

5️⃣ Admin-Level Fixes (For IT Pros)

If user fixes fail:

• Azure AD: Reset user token lifetime policies via Microsoft Entra docs.
• Conditional Access: Review policies blocking refresh.
• PowerShell: Revoke-AzureADUserAllRefreshToken -ObjectId <user-id>.

Prevention Tips: Never See Security Token Expired Again

Stay ahead:

• ✅ Enable auto-updates in Teams settings.
• ⭐ Sign out weekly if inactive.
• 🔒 Use Microsoft Authenticator for smoother MFA.
• ⚙️ Keep device time synced and avoid sketchy VPNs.

Bonus: For enterprises, configure shorter token lifetimes in Azure portal to minimize risks.

Still Stuck? Next Steps

If Microsoft Teams Error AADSTS70008 persists, gather logs (Teams > Help > Submit feedback) and contact Microsoft Support. Share error codes for faster help.

Congratulations—you're now equipped to conquer this error! Your Teams sessions will run flawlessly. Share this guide if it helped a colleague. 👏 What's your go-to fix? Drop a comment below!