IT Fix Guides & Troubleshooting
Direct, verified solutions for Windows errors, Azure bugs, Microsoft 365 issues, Active Directory problems and more — production-tested by sysadmins.
Fix Exchange Migration Error – Target Mailbox SMTP Proxy Missing – Exchange Online 2026
Exchange mailbox migration fails when target mailbox lacks required onmicrosoft.com SMTP proxy address. Fix by adding missing proxy addresses using PowerShell cmdlets or bulk scripts.
Fix Microsoft 365 Domain Reputation Block – Exchange Online 2026
Microsoft 365 domain reputation blocks prevent legitimate emails from reaching recipients. This guide provides proven methods to identify, submit, and resolve domain blocks through Microsoft Defender for Office 365.
Fix Trusted Platform Module Error 80090016 – Windows 11 2026
TPM error 80090016 prevents Microsoft 365 apps from authenticating properly. Fix by renaming the AAD BrokerPlugin folder, reinstalling WAM plugin, or clearing TPM data.
Fix Microsoft 365 Error 0x80004005 – Windows 10/11 2026
Microsoft 365 error 0x80004005 prevents Office app activation and file editing. Fix with subscription verification, updates, SaRA troubleshooter, repair, or reinstallation.