Some users may receive failures when creating channels or adding members to shared channels in Microsoft Teams

Title: Some users may receive failures when creating channels or adding members to shared channels in Microsoft Teams User impact: Users may have received failures when creating channels or adding members to shared channels in Microsoft Teams. Final status: After a period of monitoring, we confirmed that rolling back the offending update remediated impact. Scope of impact: Your organization was affected by this event, and some users may have received failures when creating channels or adding members to shared channels in Microsoft Teams. Start time: Saturday, August 1, 2026, at 1:35 AM UTC End time: Monday, August 3, 2026, at 7:07 PM UTC Root cause: A recent service update migrated JavaScript Object Notation (JSON) deserialization behavior, resulting in scenarios that rely on deserialization to utilize incorrect values and causing users to receive failures, such as when creating channels or adding users to shared channels in Microsoft Teams. Next steps: - To help prevent similar impact in the future, we're further reviewing our update release procedures to ensure we're able to better identify issues before changes are deployed. This is the final update for the event.

Title: Some users may receive failures when creating channels or adding members to shared channels in Microsoft Teams User impact: Users may receive failures when creating channels or adding members to shared channels in Microsoft Teams. Current status: After further analysis, we've validated that users can still create shared channels but may be unable to add new users to these channels. We've updated the "Title", "User impact", "Scope of impact", and “Root cause” fields to reflect this. We've rolled back the offending service update and are monitoring service availability to validate remediation. Simultaneously, we're analyzing additional recent updates to validate if there is still potential for residual impact or if the issue is fully remediated. Scope of impact: Your organization is affected by this event, and some users may receive failures when creating channels or adding members to shared channels in Microsoft Teams. This section may be updated as the investigation progresses. Start time: Saturday, August 1, 2026, at 1:35 AM UTC Root cause: A recent service update migrated JavaScript Object Notation (JSON) deserialization behavior, resulting in scenarios that rely on deserialization to utilize incorrect values and causing users to receive failures, such as when creating channels or adding users to shared channels in Microsoft Teams. Next update by: Tuesday, August 4, 2026, at 12:30 AM UTC

Title: Some users may receive failures when creating channels with Channel Capabilities or shared channels in Microsoft Teams User impact: Users may receive failures when creating channels with Channel Capabilities or shared channels in Microsoft Teams. Current status: After an internal review, we've isolated that a recent service update migrated JavaScript Object Notation (JSON) deserialization behavior, resulting in scenarios that rely on deserialization to utilize incorrect values and causing users to receive failures, such as when creating channels with Channel Capabilities or shared channels in Microsoft Teams. We're evaluating potential remediation strategies to resolve user impact as soon as possible. Scope of impact: Your organization is affected by this event, and some users may receive failures when creating channels with Channel Capabilities or shared channels in Microsoft Teams. This section may be updated as the investigation progresses. Start time: Saturday, August 1, 2026, at 1:35 AM UTC Root cause: A recent service update migrated JavaScript Object Notation (JSON) deserialization behavior, resulting in scenarios that rely on deserialization to utilize incorrect values and causing users to receive failures, such as when creating channels with Channel Capabilities or shared channels in Microsoft Teams. Next update by: Monday, August 3, 2026, at 8:00 PM UTC