Office 365 Monitoring: Teams PSTN Calls Outage (Oct. 7, 2021)
On October 7, 2021, at ~9:25 am UTC, Microsoft communicated via tweet (@MSFT365status) that they were investigating an issue in which some users were unable to make or receive PSTN calls.
Microsoft also indicated in this first notification that Europe was the only known impacted geo. The incident number for IT pros with admin center access was TM289868. The last outage/service interruption that Microsoft communicated was just 3 days ago (October 4th).