Users may see delays or page load failures while accessing OneDrive or OneNote files. Microsoft Office 365 has acknowledged this issue and is working on a fix.
Users may continue to see delays or page load failures while accessing OneDrive, OneNote files or while interacting with the desktop or online Office 365 platform. Microsoft has acknowledged this issue and is working on a fix. Below are example screenshots of error messages users may be seeing.
If interested in additional details, the information below is directly from Microsoft regarding this incident:
User Impact: Users may see latency or intermittent page load failures for SharePoint Online sites and accessing OneDrive files.
More info: Users will primarily see impact to SharePoint Online and OneDrive for Business. We’ve confirmed that some users will also see additional impact to ancillary services with dependencies on SharePoint Online, such as PowerApps, PowerAutomate, OneDrive Sync, Word, Excel, OneNote, Teams, and background applications.
During periods of impact, users may experience latency when accessing OneDrive files or receive a “503 Service Unavailable” or “Server busy” message from SharePoint.
While our throttles are in place, users may experience problems when performing migrations, OneDrive for Business syncs, OneNote syncs and large file uploads.
As an additional note, we recently altered the listed start time of the event based on a more detailed understanding of the impact.
Current status: We're continuing to monitor the environment and have observed that the service remains in a healthy state. This issue remains our highest priority and we're closely monitoring our telemetry to ensure we can quickly take action in the event impact persists. In parallel, we're taking additional actions to ensure the sync requests are processing as efficiently as possible.
Scope of impact: This issue intermittently affects users attempting to access SharePoint Online sites and OneDrive files.
Start time: Sunday, December 1, 2019, 10:00 PM (12/2/2019, 4:00 AM UTC)
Preliminary root cause: root cause: A configuration change to the SharePoint Online caching infrastructure led to increased failure rates and latency for user request traffic into SharePoint Online and OneDrive for Business.
Last updated from Microsoft: December 10, 2019 11:38 AM