Some users may not receive notifications in the Microsoft Teams desktop client

Title: Some users may not receive notifications in the Microsoft Teams desktop client User impact: Users may not receive notifications in the Microsoft Teams desktop client. More info: This issue appeared to be specific to the Microsoft Teams desktop client for Windows. Some affected users may have heard an incoming call ringtone but not received the associated notification, while other affected users may have not received notifications for chat messages. Final status: We've confirmed that deployment of both of our remediation efforts completed for all affected users and the offending configuration change was reverted. We monitored this solution as it progressed and verified that impact was resolved by our actions. Scope of impact: Some users who received incoming calls or messages and who were expecting to receive notifications in the Microsoft Teams desktop client for Windows may have been impacted. Start time: Wednesday, July 15, 2026, at 11:34 PM UTC End time: Thursday, July 23, 2026, at 8:30 PM UTC Root cause: A recent configuration change intended to address a parallel impact changed the behavior of the notification window, which resulted in notifications not being displayed as expected. Next steps: - We've deployed a pre-emptive remediation which will ensure that users do not see service interruptions when receiving this update. - We're continuing to optimize our deployment pipeline to ensure that similar issues do not reoccur. This is the final update for the event.

Title: Some users may not receive notifications in the Microsoft Teams desktop client User impact: Users may not receive notifications in the Microsoft Teams desktop client. More info: This issue appears to be specific to the Microsoft Teams desktop client for Windows. Some affected users may hear an incoming call ringtone but not receive the associated notification, while other affected users may not receive notifications for chat messages. Current status: While we continue to expedite the deployment of our fix, we've also determined that an additional mitigation will further increase its efficacy. We're monitoring both the deployment of our fix and the additional mitigation so that we can ensure full remediation. Scope of impact: Some users receiving incoming calls or messages and are expecting to receive notifications in the Microsoft Teams desktop client for Windows may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, July 23, 2026, at 2:30 AM UTC

Title: Some users may not receive notifications in the Microsoft Teams desktop client User impact: Users may not receive notifications in the Microsoft Teams desktop client. More info: This issue appears to be specific to the Microsoft Teams desktop client for Windows. Some affected users may hear an incoming call ringtone but not receive the associated notification, while other affected users may not receive notifications for chat messages. Current status: We're expediting the deployment of our fix and are monitoring progress to validate remediation. Scope of impact: Some users receiving incoming calls or messages and are expecting to receive notifications in the Microsoft Teams desktop client for Windows may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, July 23, 2026, at 11:30 PM UTC

Title: Some users may not receive notifications in the Microsoft Teams desktop client User impact: Users may not receive notifications in the Microsoft Teams desktop client. More info: This issue appears to be specific to the Microsoft Teams desktop client for Windows. Some affected users may hear an incoming call ringtone but not receive the associated notification, while other affected users may not receive notifications for chat messages. Current status: We're continuing to deploy the configuration change to the subset of affected users, after which we'll test to confirm it was effective at remedating the impact. Scope of impact: Some users receiving incoming calls or messages and are expecting to receive notifications in the Microsoft Teams desktop client for Windows may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, July 23, 2026, at 10:00 PM UTC

Title: Some users may not receive notifications in the Microsoft Teams desktop client User impact: Users may not receive notifications in the Microsoft Teams desktop client. More info: This issue appears to be specific to the Microsoft Teams desktop client for Windows. Some affected users may hear an incoming call ringtone but not receive the associated notification, while other affected users may not receive notifications for chat messages. Current status: To expedite the remediation, we're deploying a configuration change to a subset of affected users that we expect will restore the notifications. Once we've confirmed that this remediates the impact, we'll apply the change more broadly. Scope of impact: Some users receiving incoming calls or messages and are expecting to receive notifications in the Microsoft Teams desktop client for Windows may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, July 23, 2026, at 7:00 PM UTC

Title: Some users may not receive notifications in the Microsoft Teams desktop client User impact: Users may not receive notifications in the Microsoft Teams desktop client. More info: This issue appears to be specific to the Microsoft Teams desktop client for Windows. Some affected users may hear an incoming call ringtone but not receive the associated notification, while other affected users may not receive notifications for chat messages. Current status: We've identified a recent Microsoft Teams desktop client service update for Windows that correlates with the impact. We're reversing this service update to confirm whether this remediates the impact. Scope of impact: Some users receiving incoming calls or messages and are expecting to receive notifications in the Microsoft Teams desktop client for Windows may be impacted. This information may be updated as our investigation continues. Next update by: Thursday, July 23, 2026, at 5:00 PM UTC

Title: Some users may not receive notifications in the Microsoft Teams desktop client User impact: Users may not receive notifications in the Microsoft Teams desktop client. More info: This issue appears to be specific to the Microsoft Teams desktop client for Windows. Some affected users may hear an incoming call ringtone but not receive the associated notification, while other affected users may not receive notifications for chat messages. Current status: We're analyzing diagnostic data from a sample of affected users to investigate the root cause of the issue and identify a mitigation strategy. In parallel, we're reviewing recent Teams client updates to determine whether a recent change may be contributing to the impact. Scope of impact: Some users expecting to receive notifications in the Microsoft Teams desktop client for Windows may be impacted. Next update by: Thursday, July 23, 2026, at 3:00 PM UTC

Title: Some users may not receive notifications in the Microsoft Teams desktop client User impact: Users may not receive notifications in the Microsoft Teams desktop client. More info: This issue appears to be specific to the Microsoft Teams desktop client for Windows. Some affected users may hear an incoming call ringtone but not receive the associated notification, while other affected users may not receive notifications for chat messages. Current status: We're analyzing diagnostic data from a sample of affected users to investigate the root cause of the issue and identify a mitigation strategy. In parallel, we're reviewing recent Teams client updates to determine whether a recent change may be contributing to the impact. Scope of impact: Some users expecting to receive notifications in the Microsoft Teams desktop client for Windows may be impacted. Next update by: Thursday, July 23, 2026, at 3:00 PM UTC

Title: Some users may not see incoming call notifications in Microsoft Teams User impact: Users may not see incoming call notifications in Microsoft Teams. More info: Affected users may hear the incoming call ringtone but not see the incoming call notification toast. Reports indicate the issue occurs consistently for affected users and may result in missed calls, despite the incoming call reaching the client. Current status: We're analyzing diagnostic data from affected users and reviewing the results of ongoing testing. We've observed that one affected user no longer experiences the issue after reverting to an earlier version of the Teams desktop client. We're investigating the root cause of the issue, including whether it may be related to a recent Teams client update. Scope of impact: Your organization is affected by this event, and some users attempting to receive incoming Microsoft Teams calls are impacted. Next update by: Thursday, July 23, 2026, at 2:30 PM UTC

Title: Some users may not see incoming call notifications in Microsoft Teams User impact: Users may not see incoming call notifications in Microsoft Teams. More info: Affected users may hear the incoming call ringtone but not see the incoming call notification toast. Reports indicate the issue occurs consistently for affected users and may result in missed calls, despite the incoming call reaching the client. Current status: We're reviewing client telemetry and diagnostic logs to identify what prevented the incoming call notification from appearing and to determine the next steps required to mitigate impact. Scope of impact: Your organization is affected by this event, and some users attempting to receive incoming Microsoft Teams calls are impacted. Next update by: Thursday, July 23, 2026, at 1:00 PM UTC