Office 365 Securet is being throttled.
Possible 503 errors reported in CloudSOC investigate.
Microsoft will dynamically throttle API requests in order to protect SharePoint resources from being overwhelmed and degrading the SharePoint platform.
It is possible that CloudSOC could make a high number of API calls when mass changes are made to SharePoint data including: data migration, rights or data modification.
When throttling occurs, CloudSOC will resend and process the requests following Microsoft best practices.
The Broadcom CASB team works directly with Microsoft to ensure best practices are followed in order to be efficient. Microsoft dynamic throttling is not based on a total number of api calls.
Possible symptoms of throttling include: