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Fix DeviceAuthenticationFailed Error 50155 on Windows Sign-In
Question details
Users encounter a DeviceAuthenticationFailed (Error 50155) when signing in to Entra-joined computers after a cross-tenant synchronization.
- Product
- Microsoft Entra
- Device & OS
- Windows
- Scenario
- Signing in to an Entra-joined computer in a target tenant after cross-tenant user synchronization.
- Observed behavior
- The system displays DeviceAuthenticationFailed error 50155, blocking successful sign-in to the target tenant environment.
Ensure you have Global Administrator privileges in the Microsoft 365 admin center before attempting to resolve this cross-tenant integration issue.
Contact Microsoft 365 Business Support
Because this error involves complex cross-tenant synchronization and hybrid-joined source tenants, Microsoft backend support is required to investigate logs and configurations.
Error 50155 typically occurs in environments with cross-tenant synchronization involving a hybrid-joined source tenant and an Entra-only target tenant. Because this requires backend log analysis and tenant configuration review, it cannot be resolved through standard local troubleshooting on the Windows device.
As a Global Administrator, navigate to the Microsoft 365 admin center and log in with your administrative credentials.
Go to the 'Support' section on the left navigation menu and select 'New service request'.
Describe the DeviceAuthenticationFailed error 50155. Mention the cross-tenant sync setup, the hybrid-joined source tenant, and the Entra-only target tenant, then submit the request so engineers can collect logs and escalate.
Work Efficiently While Your Sync Issue is Resolved
While Microsoft support investigates your tenant synchronization errors, you can continue your daily document work using WPS Office. It provides a lightweight, free, and highly compatible alternative to Microsoft Office, letting you view, edit, and collaborate on documents without relying on specific Entra ID cloud authentication.
- 1. Download WPS Office: Visit the official WPS website to download the free installation package for Windows.
- 2. Install the Suite: Run the downloaded installer and follow the on-screen instructions for a quick, lightweight installation.
- 3. Start Working Offline: Open WPS Writer, Spreadsheet, or Presentation to immediately start working on your local documents without relying on Entra sign-in.
Frequently Asked Questions
What does Error 50155 mean during Windows sign-in?
Error 50155 indicates a DeviceAuthenticationFailed event. It often occurs when device trust or token validation fails between a synchronized user's source and target tenants.
Can a standard user fix the cross-tenant sync error 50155?
No. This error involves backend tenant configurations and cross-tenant synchronization rules. A Global Administrator must investigate the logs or contact Microsoft Support to resolve it.
Are local Windows accounts affected by this Entra ID error?
Local Windows accounts bypass Microsoft Entra authentication, so they can still log in to the machine. However, they will not have access to Entra-secured cloud resources.
