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Microsoft Teams Error CAA70004 — Sign-In and Authentication Loop

Errorapplication

Overview

Fix Microsoft Teams desktop error code CAA70004 causing sign-in failures, authentication loops, and inability to access Teams on Windows.

Key Details

  • Error CAA70004 is a Teams desktop authentication error preventing successful sign-in
  • The error creates a loop where Teams repeatedly asks for credentials but never completes sign-in
  • This typically affects the Teams desktop app, not the web version in the browser
  • The issue is often related to cached credentials, proxy settings, or conditional access policies
  • Multiple Microsoft 365 accounts on the same machine can trigger this error

Common Causes

  • Corrupted Teams cache or credential store causing authentication to fail
  • Network proxy or VPN interfering with Microsoft 365 authentication endpoints
  • Conditional access policy requiring device compliance that the machine does not meet
  • Multiple Microsoft 365 accounts creating credential conflicts in the credential manager

Steps

  1. 1Clear Teams cache: close Teams, delete contents of %appdata%\Microsoft\Teams, restart Teams
  2. 2Clear Windows credentials: Credential Manager > Windows Credentials > remove all Microsoft/Teams entries
  3. 3Disable proxy temporarily: Settings > Network & Internet > Proxy > turn off manual proxy setup
  4. 4Try signing in via Teams web (teams.microsoft.com) to verify credentials work
  5. 5Reinstall Teams: uninstall completely, delete %appdata%\Microsoft\Teams folder, reinstall from teams.microsoft.com

Tags

teamscaa70004sign-inauthenticationoffice-365

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Frequently Asked Questions

Teams stores authentication tokens, user settings, and session data in its cache folder. Corrupted cache data can cause the app to use invalid tokens, creating sign-in loops. Clearing forces a fresh authentication.