Some users may be unable to retrieve e-mail addresses using the SharePoint Online Client Side Object Model (CSOM) API

Title: Some users may be unable to retrieve e-mail addresses using the SharePoint Online Client Side Object Model (CSOM) API

User impact: Users may be unable to retrieve e-mail addresses using the SharePoint Online CSOM API.

Current status: We've reproduced the issue internally to help analyze calls made by the API that retrieves user email information to isolate potential discrepancies that may contribute to impact, which will help determine our next troubleshooting steps.

Scope of impact: Users attempting to retrieve e-mail addresses via the SharePoint Online CSOM API may be impacted. This section may be updated as the investigation progresses.

Next update by: Tuesday, December 16, 2025, at 12:00 AM UTC

Title: Some users may be unable to retrieve e-mail addresses using the SharePoint Online Client Side Object Model (CSOM) API

User impact: Users may be unable to retrieve e-mail addresses using the SharePoint Online CSOM API.

Current status: We’re analyzing calls made by the specific API utilized when retrieving user email information to isolate potential discrepancies pointing to why this information isn’t being sent to SharePoint Online, which will determine our next troubleshooting steps.

Scope of impact: Users attempting to retrieve e-mail addresses via the SharePoint Online CSOM API may be impacted. This section may be updated as the investigation progresses.

Next update by: Monday, December 15, 2025, at 10:00 PM UTC

Title: Some users may be unable to retrieve e-mail addresses using the SharePoint Online CSOM API

User impact: Users may be unable to retrieve e-mail addresses using the SharePoint Online CSOM API.

Current status: We’re working to identify the change that caused user email information to be missing when retrieving data from SharePoint Online.

Scope of impact: Users attempting to retrieve e-mail addresses via the SharePoint Online CSOM API may be impacted.

Next update by: Monday, December 15, 2025, at 4:30 PM UTC

Title: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected

User impact: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected.

Current status: We’ve successfully reproduced the issue and have determined that the expected user email information is missing when retrieving data from SharePoint Online. We’re reviewing log files to identify the root cause of the issue.

Scope of impact: Your organization is affected by this event, and users attempting to access some SharePoint Online sites are impacted. This information may be updated as our investigation continues.

Next update by: Monday, December 15, 2025, at 1:00 PM UTC

Title: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected

User impact: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected.

Current status: We're continuing to wait for your representatives to provide fresh logs from reproducing the issue to aid in the root cause investigation.

Scope of impact: Your organization is affected by this event, and users attempting to access some SharePoint Online sites are impacted. This information may be updated as our investigation continues.

Next update by: Monday, December 15, 2025, at 11:00 AM UTC

Title: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected

User impact: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected.

Current status: Our analysis into the correlation IDs has been inconclusive. We're reaching out to your representatives requesting fresh HTTP Archive format (HAR) files from users reproducing the issue to help with our investigation.

Scope of impact: Your organization is affected by this event, and users attempting to access some SharePoint Online sites are impacted. This information may be updated as our investigation continues.

Next update by: Monday, December 15, 2025, at 8:00 AM UTC

Title: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected

User impact: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected.

Current status: We're continuing to investigate the correlation IDs of some users that are impacted to help with isolating the source of the issue.

Scope of impact: Your organization is affected by this event, and users attempting to access some SharePoint Online sites are impacted. This information may be updated as our investigation continues.

Next update by: Monday, December 15, 2025, at 5:30 AM UTC

Title: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected

User impact: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected.

Current status: We're reviewing correlation IDs of some users that are impacted to help with the investigation and to determine our next troubleshooting steps.

Scope of impact: Your organization is affected by this event, and users attempting to access some SharePoint Online sites are impacted. This information may be updated as our investigation continues.

Next update by: Monday, December 15, 2025, at 3:30 AM UTC

Title: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected

User impact: Users can't access some SharePoint Online sites and see that multiple applications can't be used as expected.

Current status: We're investigating a potential issue with SharePoint Online and checking for impact to your organization. We'll provide an update within 30 minutes.