Microsoft 365 Sign In Issues

https://learn.microsoft.com/en-us/microsoft-365/troubleshoot/authentication/automatic-authentication-fails
Authentication automatically fails in some Microsoft Office applications and Outlook may go into the “Need Password” state without any interaction.

if (-not (Get-AppxPackage Microsoft.AAD.BrokerPlugin)) { Add-AppxPackage -Register “$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\Appxmanifest.xml” -DisableDevelopmentMode -ForceApplicationShutdown } Get-AppxPackage Microsoft.AAD.BrokerPlugin

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https://learn.microsoft.com/en-us/microsoft-365/troubleshoot/authentication/cannot-sign-in-microsoft-365-desktop-apps
The sign-in prompts are intermittent.
The sign-in window shows a blank authentication screen.
The Outlook desktop client displays “Trying to connect…”.
The Teams desktop client displays “We weren’t able to connect. Sign in and we’ll try again.”

Get-AppxPackage Microsoft.AAD.BrokerPlugin
Get-AppxPackage Microsoft.Windows.CloudExperienceHost

explorer.exe shell:appsFolder\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy!App
explorer.exe shell:appsFolder\Microsoft.Windows.CloudExperienceHost_cw5n1h2txyewy!App

(Reinstall the WAM [Web Account Manager] plug-ins)
Add-AppxPackage -Register “$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\Appxmanifest.xml” -DisableDevelopmentMode -ForceApplicationShutdown
Add-AppxPackage -Register “$env:windir\SystemApps\Microsoft.Windows.CloudExperienceHost_cw5n1h2txyewy\Appxmanifest.xml” -DisableDevelopmentMode -ForceApplicationShutdown