sending failed

Question

I cannot send messages in Microsoft Teams. Every message immediately shows “sending failed”. This happens on all devices (desktop app, browser, mobile), different networks and with/without VPN.

I can receive messages and make calls without issues.

This is a personal account, not a work account.

Could you please check if there is any restriction or issue with my account?

Answer 1

Dear Toshiro Hatori, 

Thank you for posting your question to the Microsoft Q&A forum and for providing such a clear description. I understand how frustrating it is to suddenly lose the ability to send messages on your personal account, and I appreciate you reaching out for assistance. 

Before we conclude that this is a deeper account issue, please open a private or Incognito tab in your web browser, navigate to Teams for Web (teams.live.com), and try sending a message. 

• If the message sends successfully in the Incognito tab, the issue is tied to your browser's cached data. You will simply need to clear your browser's cookies and cache. 
• If the message still fails to send in the Incognito tab, this confirms a different underlying cause. 

In that case, could you please confirm: 

• Does this happen to all chats? 
• Only messages to specific people (e.g., only work/school accounts)? 
• Both existing conversations and brand-new chats? (Note: If the failure only occurs when messaging work/school accounts, the recipient's organization may have disabled external chat with personal accounts via their IT admin policies). 

The fact that this failure happens on all devices (desktop, browser, mobile), on different networks, and with/without a VPN—while you can still receive messages and make calls—strongly suggests that your Microsoft account has been flagged by the automated security system.

As community support agent, I unfortunately do not have backend server access to view personal account data or manually remove automated security blocks. To request a manual review of your account status, you will need to submit a ticket directly to Microsoft Support so they can investigate and see if they can lift the block for you. 

How to Submit a Microsoft Support Ticket: 

1. Navigate to the official Microsoft Contact Us page: https://support.microsoft.com/contactus 
2. Select Microsoft Teams and then click on Get Home Support. 
3. In the search box, type a brief description of the issue (e.g., "Account blocked from sending messages in Teams") and click Get Help. 
4. Scroll to the bottom of the page and select the Contact Support button. 

Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas only.

In the meantime, you can try these steps: 

1. Wait 48-72 hours 

If this is a temporary automated restriction, it may automatically lift after a short cooldown period. 

2. Sign Out Everywhere and Clear Cache 

• Sign out of Teams on all devices. 
• Desktop App (Windows): Close Teams completely (right-click system tray -> Quit). Press Windows + R, copy and paste this %localappdata%\Packages\MSTeams_8wekyb3d8bbwe and press Enter. Delete all contents inside this folder. 
• Mobile: Go to your device's app settings and clear the app cache (or uninstall and reinstall). 
• Wait 5 minutes, sign back into one device only, and test. 

I hope this explanation provides a clear path forward. Please let me know if you need assistance navigating the reinstatement form. 

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