Microsoft 365 Apps: sign-in fails with "Something went wrong [1001]"
Summary
Users cannot sign in to Microsoft 365 desktop apps and get the error "Something went wrong [1001]". Microsoft confirms the issue and names two main causes: security software affecting the WAM plug-in, and roamed user profile data. Microsoft lists the status as investigating; partial fixes are in newer Office versions and temporary workarounds exist.
Symptoms
Sign-in to Microsoft 365 desktop applications fails with the error "Something went wrong. [1001]".
Affected
- Excel, Word, Outlook, PowerPoint for Microsoft 365
- Outlook for Microsoft 365 for Mac
- Microsoft 365 Apps for business
- Scenario 1: devices where security software affects the WAM (Web Account Manager) plug-in (AAD.BrokerPlugin)
- Scenario 2: VDI and physical devices with roamed user profile data
Workaround
- Reboot the device.
- Scenario 1: in user-mode PowerShell run Add-AppxPackage -Register "$env:windir\SystemApps\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy\Appxmanifest.xml" -DisableDevelopmentMode -ForceApplicationShutdown and the same command for Microsoft.Windows.CloudExperienceHost_cw5n1h2txyewy to repair WAM.
- Scenario 2: do not roam %localappdata%\Packages\Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy, %localappdata%\Packages\Microsoft.Windows.CloudExperienceHost_cw5n1h2txyewy, %localappdata%\Microsoft\TokenBroker, the TokenBroker folders under app packages, or the registry keys HKEY_CURRENT_USER\SOFTWARE\Microsoft\IdentityCRL, ...\Windows\CurrentVersion\AAD and ...\Windows NT\CurrentVersion\WorkplaceJoin. Do not roam the "MS-Organization-Access" device certificate.
- Meanwhile use Outlook on the web, Office web apps or mobile apps.
Fix
Not fixed completely. Office Version 2310 (Current Channel) and Version 2309 (Monthly Enterprise Channel) include fixes for certain sign-in failure scenarios, but sign-in can still fail for other causes.
Recommendation
Update Microsoft 365 Apps to a current version, check whether security software interferes with WAM, and make sure profile migration or roaming tools exclude the listed folders and keys. If the error persists, have the tenant admin open a support ticket in the Microsoft 365 admin portal, with MSOAID logs captured after completely uninstalling security software.
Sources
- Microsoft: Error "Something Went Wrong [1001]" signing in to Microsoft 365 Desktop Applications Vendor · support.microsoft.com
- Can't sign in to Microsoft 365 desktop applications Vendor · learn.microsoft.com
- Fix authentication issues in Office applications Vendor · learn.microsoft.com
- Device identity and desktop virtualization Vendor · learn.microsoft.com
- Update history for Microsoft 365 Apps Vendor · learn.microsoft.com
- Use MSOAID for authentication issues Vendor · learn.microsoft.com
Compiled from the sources listed and translated with AI (Claude); status and dates come from the vendor. The vendor’s statements are authoritative. Updated 1 Nov 2026, 18:20.
Where the information comes from
We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:
- Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
- other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
- community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
- targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
- early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online
Summary and translation with AI (Claude by Anthropic) – without any data of visitors.
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