Inconsistent delivery of Microsoft Teams channel notifications across multiple channels and users.

Question

Inconsistent delivery of Microsoft Teams channel notifications across multiple channels and users.

RUSU Amalia 20

Microsoft Teams channel notifications triggered by @channel mentions are being delivered inconsistently. The issue began approximately two weeks ago and affects a large user group (~80 users) across multiple Teams channels. Prior to this period, notifications were working as expected. No changes were made to user notification settings or channel configurations at the time the issue started, which indicates that this is unlikely to be caused by individual user preferences or channel-level settings. Some users receive the notifications, while others do not, or receive them only sporadically. The issue is reproducible across different channels and users. As an example, I did not receive any notifications in the Teams desktop client for the last three posts in one affected channel. When I accessed Teams via the web client, I was able to see only one of these three notifications, which indicates inconsistent notification behavior between the Teams desktop and web clients. Additionally, many channels were recently automatically set to “Hidden.” Even after users manually selected “Show” for these channels, notifications continue to be missing or unreliable. Removing and re-adding users to channels is not a viable workaround due to the number of affected users and channels involved.
We would appreciate your help in looking into this issue and letting us know whether it is a known or currently ongoing problem in Microsoft Teams. If this is the case, any guidance on possible workarounds, mitigations, or upcoming fixes would be very helpful. Given the number of users and channels affected, we would also appreciate recommendations for a scalable solution that does not require manual changes at user or channel level.
Thank you.

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Answer 1

Hello @RUSU Amalia,

Thank you for taking the time to share the detailed description of the issue.

Based on the information provided, I have reviewed the available resources and documentation; however, I was unable to find any related active incidents, service advisories, or official announcements from Microsoft that specifically address this behavior at this time.

Given the scope of the impact, the inconsistent behavior across users and clients, and the absence of a documented advisory, I recommend contacting the Microsoft Technical Support team for further investigation.

Microsoft Support has access to backend telemetry, tenant-level diagnostics, and service health insights that are not available through standard documentation or community channels. This deeper level of analysis will help determine whether the issue is related to a service change, a tenant-specific condition, or an emerging platform issue that requires escalation.

For business support:

Collect Teams diagnostic logs: To help Microsoft troubleshoot the issue, affected users should first collect Teams logs from their device. If multiple users are affected, logs from 2-3 impacted users are usually sufficient: Collect log files for monitoring and troubleshooting in Teams - Microsoft Teams | Microsoft Learn
Find your Microsoft 365 admin: If you don't know who the global admin is in your organization, you can find guidance here: How can I find my Microsoft 365 admin? - Microsoft Support
Submit a service request: The Global Administrator should create a support request with Microsoft to receive advanced technical assistance. For detailed instructions, see: Get support - Microsoft 365 admin | Microsoft Learn
If your organization's subscription is from a partner or reseller, contact the reseller's support provider to help open a service request on behalf of you instead.

If you discover any solutions or have additional insights, please consider replying to this thread to help others in the community.

I sincerely apologize for redirecting you to the Microsoft Technical Support Team. While I strive to assist as much as possible here in the forum, my resources are limited when it comes to backend-level diagnostics and advanced troubleshooting.

I appreciate your patience and understanding, and I encourage you to reach out to Microsoft Support so they can assist with more advanced troubleshooting and provide authoritative guidance.

Thank you, and please let me know if you need help engaging Microsoft Support or gathering any required information for the support request.

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