New Teams, messages stuck on sending, web and app problem

Question

New Teams, messages stuck on sending, web and app problem

AntSko 10

Hi,

My colleague has an issue where she is unable to send messages in Teams. Private and to groups. The problem appears to occur randomly.

Temporary workarounds:

Web version: Log out and log back in.
Teams desktop app: Fully terminate the application (simply closing it is not enough), then run Repair. After reopening the app, all previously undelivered messages are sent.

The issue first occurred on June 3rd. At that time, updating Teams was enough to resolve it. The problem then occurred again, so I reinstalled Teams and performed a full reset of all files, including hidden ones. This resolved the issue only temporarily, and the problem returned. Since Thursday and Friday were holidays, we were only able to investigate it again today. Today, the issue occurred twice more.

We updated Teams again to version 26134.1702.4747.7366. She is using Microsoft 365 Apps for Business (Classic). All policies appear to be configured correctly, and neither her password nor MFA settings have been changed recently. The Teams mobile app works correctly.

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Answer 1

Hi AntSko,

Good day and thank you for providing such a detailed description of your concern. Your observations are helpful, especially as similar reports have been noted recently. To determine whether this is a server-side issue, further investigation involving backend validation would be required.

Given the nature of the problem, the most effective next step is using your admin credentials to submit a support request through the Microsoft 365 Admin Center.

Microsoft also provides customer service phone numbers based on your region. You can find the appropriate contact number here: Customer service phone numbers - Microsoft Support

This route ensures that a Microsoft support engineer can initiate a remote session to investigate backend configurations, run advanced diagnostic tools, and, if necessary, escalate the case to specialized teams with access to internal systems and logs. These backend resources are essential for resolving issues that go beyond what’s visible in the user interface.

As community moderators, we’re here to guide you, but due to privacy and security limitations, we don’t have access to the backend tools required for a full resolution. For this reason, contacting Microsoft Support via the Admin Center is the most secure and efficient way forward.

I hope this helps you resolve the issue quickly. I’m glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.

If you find my post helpful, kindly consider marking it as the accepted answer. Doing so can assist others in the community who may have similar questions in finding solutions more quickly.

Thank you for your kindness and contributions to the forum.

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