Some users may be unable to create new online meetings from shared calendar events in Exchange Online

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may have been unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users could create online meetings from their personal calendars as an alternative method, and existing shared calendar events remained unaffected.

Final status: We've confirmed that the fix to address the impact to the authorization component of the calendar service has completed and, after monitoring service health metrics to ensure the associated failures have ceased, we've verified the impact is remediated.

Scope of impact: Impact was specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

End time: Friday, June 12, 2026, at 7:49 PM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service which resulted in the impact.

Next steps:
- We're reviewing our updates standards to ensure similar issues are identified and corrected ahead of deployment to prevent this from reoccurring.

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current status: The deployment of the fix has saturated 89 percent of the affected environment, and our projection based on the current rate of the deployment indicates the impact will be remediated for all remaining users by the time of our next scheduled update.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Saturday, June 13, 2026, at 1:00 AM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current status: We've completed our validation of the fix, and it is currently deployed with a saturation progress of 87 percent. Some users may already see the issue mitigated as this continues to saturate all affected areas. We're continuing to monitor the deployment and anticipate having an update on its completion timeline at our next communication.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Tuesday, June 9, 2026, at 7:00 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current status: Validation of our solution to address the affected authorization component is underway, and we'll provide a timeline for deployment as one becomes available.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Monday, June 8, 2026, at 6:00 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current status: The development and validation of the code fix is taking longer than expected due to an issue that's unrelated to this event. We're working to resolve these issues and once complete, we'll proceed with the validation of the code fix.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Thursday, June 4, 2026, at 6:00 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current status: Our work on developing and validating the code fix continues. The additional time ensures that all impacted areas are captured in the fix and helps us verify its effectiveness before beginning deployment.  

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Tuesday, June 2, 2026, at 6:00 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current status: Our work on developing and validating the code fix continues. The additional time ensures that all impacted areas are captured in the fix and helps us verify its effectiveness before beginning deployment.  

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Tuesday, June 2, 2026, at 6:00 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current status: Our work on developing and validating the code fix continues. The additional time ensures that all impacted areas are captured in the fix and helps us verify its effectiveness before beginning deployment.  

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Tuesday, June 2, 2026, at 6:00 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

More info: Affected users can create online meetings from their personal calendars as an alternative method, and existing shared calendar events remain unaffected.

Current status: We've identified that a recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact. We're developing and validating a code fix to address the issue and will provide a deployment timeline once it becomes available.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Root cause: A recent service update in Exchange Online introduced an issue within an authorization component of the calendar service, resulting in impact.

Next update by: Monday, June 1, 2026, at 6:00 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

Current status: We’re continuing to investigate the issue that is causing failures when obtaining authentication tokens within the calendar service. We’re also continually working to validate if the aforementioned service update is contributing to impact, and what remediation actions are required.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Start time: Saturday, May 9, 2026, at 1:16 AM UTC

Next update by: Saturday, May 30, 2026, at 8:00 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

Current status: We’re investigating an issue that is causing failures when obtaining authentication tokens within the calendar service. We’ve identified a potential correlation with a recent service update and are testing mitigation actions to validate impact and confirm a resolution path.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Next update by: Saturday, May 30, 2026, at 1:30 PM UTC

Title: Some users may be unable to create new online meetings from shared calendar events in Exchange Online

User impact: Users may be unable to create new online meetings from shared calendar events in Exchange Online.

Current status: We’re reviewing service telemetry to isolate the root cause of the issue and determine a fix.

Scope of impact: Impact is specific to some users attempting to create new online meetings from shared calendar events in Exchange Online.

Next update by: Saturday, May 30, 2026, at 11:30 AM UTC