Office 365 — Problems Signing Into Office, Outlook, Teams

On Windows 10, if experiencing the following problems:

• When attempting to sign into Microsoft Office, Outlook or Teams, the sign-in process may seem to complete successfully but nothing happens.

• Outlook continually prompts for credentials for an Office 365 mailbox but doesn't connect.

• If adding an Office 365 mailbox to Outlook, it eventually says “An encrypted connection to your mail server is not available. Click Next to attempt using an unencrypted connection.”

• In Settings → Accounts → Access Work or School → Connect, the sign-in dialog flashes quickly but disappears.

This may occur if the Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy Universal app has corrupt information.

To remedy, open PowerShell and enter:

Get-AppxPackage -Name "Microsoft.AAD.BrokerPlugin*" | ForEach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppxManifest.xml"}

or on Windows 11:

Get-AppxPackage -Name "Microsoft.AAD.BrokerPlugin*" | Reset-AppxPackage