Microsoft confirmed that a section of their service infrastructure was performing below acceptable thresholds, resulting in meeting access issues. They rerouted traffic to alternate infrastructure to remediate impact.
Microsoft are analyzing performance data and trends on the affected systems to help prevent this problem from happening again.
This is the final update for the event.
Microsoft has alerted us that some users might be unable to access the Microsoft Teams service.
Microsoft incident ID: TM235950
User Impact: Users may be unable to access the Microsoft Teams service.
Current status: Microsoft is analyzing their service monitoring telemetry to isolate the source of the issue and help establish a fix.
Scope of impact: Initial reports indicate that impact is specific to users hosted in Northern Europe.