To successfully sign in to the Teams mobile app, please ensure the following:

✅ Required Sign-In Format

• Email address: Typically in the format EmployeeID@*****.co.jp
• Password: The same password you use to sign in to Windows after installing Office 365

🔐 Important Notes

• Passwords are case-sensitive—double-check for uppercase/lowercase characters.
• If your credentials are correct but sign-in still fails, the issue may be with the Teams app itself.

🧼 Troubleshooting Step: Clear Teams Mobile App Cache

• On iPhone: Go to Settings > Teams > Clear App Data (or uninstall and reinstall the app)
• On Android: Go to Settings > Apps > Teams > Storage > Clear Cache

This may resolve temporary app-related issues and allow you to sign in successfully.