Latest status from Microsoft: ---- We've determined that an authentication certificate has expired causing users who have logged out and those that are still logged in to have issue using the service. We're developing a fix to apply a new authentication certificate to the service which will remediate impact. ---- Nothing like your cert expire to cause an outage for thousands of customers From: Outages <outages-bounces@outages.org> On Behalf Of Martin Hepworth via Outages Sent: Monday, February 3, 2020 9:17 AM To: Chris Boyd <cboyd@gizmopartners.com> Cc: outages@outages.org Subject: Re: [outages] Widespread issues with MS Teams Europe and US - probably worldwide but apac are probably asleep On Mon, 3 Feb 2020 at 15:00, Chris Boyd via Outages <outages@outages.org<mailto:outages@outages.org>> wrote: Users can't log in via desktop, web or mobile clients. Confirmed by @MSFT365Status on twitter. --Chris _______________________________________________ Outages mailing list Outages@outages.org<mailto:Outages@outages.org> https://puck.nether.net/mailman/listinfo/outages<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpuck.nether.net%2Fmailman%2Flistinfo%2Foutages&data=02%7C01%7Crchoi%40rightpoint.com%7Cd3f1256c7a034410242c08d7a8bc419d%7C5fbbce2ac3e64b5ea51f222674fdb44d%7C1%7C0%7C637163398826825480&sdata=U2DO%2FxfqwR1ldTtHK%2F3nqslWXULZiETkP1Vu5nSwQFI%3D&reserved=0> -- -- Martin Hepworth, CISSP Oxford, UK