May 2026

regressions

• [WORKAROUND]
  Outlook

  Copilot Chat/Copilot buttons disappeared in Classic Outlook for Windows users with Copilot Chat (Basic) licenses, but Microsoft has now issued a fix.

  7 reports · 2 admins · last seen 7/2/2026 · sources →

• [BREAKS-PROD]
  Active Directory

  MFA setup and My Sign-Ins service are experiencing an outage preventing users from configuring MFA or accessing sign-in information.

  6 reports · 5 admins · last seen 6/1/2026 · sources →

• [WORKAROUND]
  Windows UpdateKB5089549

  May 2026 Windows 11 security update (KB5089549) caused installation failures with 0x800f0922 errors, now resolved by Microsoft after initial deployment.

  5 reports · 3 admins · last seen 6/1/2026 · sources →

• [MINOR]
  Other

  Recent Windows update causes file deletion dialogs to display internal gibberish instead of recognizable file names.

  5 reports · 2 admins · last seen 6/19/2026 · sources →

• [WORKAROUND]
  Windows UpdateKB5036896, KB5036899

  April 2025 Windows Updates (KB5036896, KB5036899) break Mitel Connect services (HQ/DVS) preventing them from starting; requires uninstalling KBs to resolve. Mitel defect MiVC-6310.

  1 report · 1 admin · last seen 5/15/2026 · sources →

• [BREAKS-PROD]
  Intune

  Autopilot enrollment fails with 0x800705b4 for devices using existing WDAC/App Control for Business V1 policies set to Constrained Language Mode (CSL), blocking the Intune enrollment agent.

  1 report · 1 admin · last seen 5/14/2026 · sources →