Some users in South Africa may have been unable to open Excel Online files

Title: Some users in South Africa may have been unable to open Excel Online files
User impact: Users may have been unable to open Excel Online files.
More info: Affected users may have encountered impact when accessing Excel Online files through the zac-excel.officeapps.live.com address.
Final status: We’ve determined that a recent standard service update to a section of networking infrastructure inadvertently contained a regression that resulted in Excel Online files to not open as expected. We’ve reverted the update and confirmed after a period of monitoring that impact has been remediated.
Scope of impact: Impact was specific to some users located in South Africa attempting to open Excel Online files.
Start time: Thursday, January 18, 2024, at 11:35 AM UTC
End time: Thursday, January 18, 2024, at 12:00 PM UTC
Root cause: A recent standard service update to a section of networking infrastructure inadvertently contained a regression that resulted in Excel Online files to not open as expected.
Next steps:
– We’re reviewing our standard service update procedures to better identify similar issues during our development and testing cycles.
This is the final update for the event.