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SharePoint External B2B Guest — Access Blocked (Error AADSTS90072)

Jun 26, 2026 AADSTS90072, SharePoint loop, B2B guest error, External access blocked, MicrosoftAccount mismatch, ExternalAzureAD, Remove-SPOUser, Entra ID guest reset 0 0 38 0/5 (0 Vote)

## Symptom An external guest user attempts to access a shared SharePoint Online file or folder using an authentic invitation link, but the login process fails with a hard stop on a Microsoft "Sorry, but we're having trouble signing you in"... Read More

Windows Update Installation Error 0x80073D02

Apr 17, 2025 Update error 0 0 12.45K 0/5 (0 Vote)

The following steps will usually cure the Update Installation Error Corrupted Store Cache: Damaged files within the Windows Store cache can prevent updates from downloading properly.  Microsoft Store App Issues: Problems with the Microsoft Store... Read More

Resolve VSS Error 8194 Event Viewer

Sep 17, 2018 VSS errors 0 5 23.60K 6.17/5 (6 Votes)

When you start the Remote Backup program you may experience multiple instances of VSS Error 8194 in the Application event log. These errors DO NOT generally impact the ability of the program to perform online backups, but often raise questions from... Read More

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