
Fix Microsoft Teams Modern Authentication Failure
When Microsoft Teams shows 'We couldn't sign you in' or 'unable to authenticate with modern authe...
Software troubleshooting desk

When Microsoft Teams shows 'We couldn't sign you in' or 'unable to authenticate with modern authe...

If you notice your Windows 10 system running slowly and Task Manager shows high CPU usage from 'W...

You click the Windows Security icon in the taskbar or open it from Settings, but nothing happens—...

You may see a throttling error in Microsoft Teams when sending a high volume of messages, adding ...

You're working in Microsoft Teams when a message pops up: "Your token has expired" or "Authentica...

If you notice that Windows Security (formerly Windows Defender) is using a lot of memory—sometime...