Analyzing the Teams Outage of 18 February 2019

Teams problem TM173756

Microsoft Teams suffered its first major worldwide outage on 18 February 2019. Users reported a failure to connect because Teams couldn’t authenticate them. The Post-Incident report for TM173756 revealed an issue with the Azure Key Vault. What’s more interesting is that the issue affected users in multiple Office 365 datacenter regions, which is not good.