If you’re encountering problems accessing Microsoft Teams via a browser, especially when signed in with multiple Office 365 accounts, the issue may be related to account conflicts or browser cache.

🧪 Troubleshooting Steps

A. Check for Account Conflicts

• Sign out of all Office 365 accounts.
• Sign in using your individual employee account (typically in the format employee_number@*****.co.jp).
• Confirm whether the error persists across different accounts.

B. Clear Your Browser Cache

• Open your browser settings.
• Clear Browsing History, Download History, Cookies and other site data, and Cached images and files.
• Restart the browser and try accessing Teams again.

These steps often resolve browser-based access issues caused by session conflicts or outdated data. If problems persist, consider using the Teams desktop app for a more stable experience.