Microsoft 365 authentication error (code 135011) occurs.

Question

職場で使用しているWindows11のPCでmicrosoft365の認証で問題が発生します。認証できないのでOutlook、Teamsといったサービス利用ができません。コード135011

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An authentication issue occurs with Microsoft 365 on a Windows 11 PC used at work. Because authentication fails, services such as Outlook and Teams cannot be used. Error code: 135011.

Answer 1

"Since you are using English and this is an English‑language forum, I will provide my answer in the same language to keep our conversation smooth."

Hello @東 慶太郎

Welcome to Q&A forum!

The error code 135011 usually occurs because the device has been disabled by your organization.

In other words, the device itself is blocked in Microsoft Entra ID (formerly Azure Active Directory). Even if your user account is still active, Microsoft 365 services such as Outlook, Teams, and other Office applications will not allow you to sign in until the device is re-enabled.

This is a device-level security restriction, not an issue with the application or user credentials.

To resolve this issue, the device must be enabled from the Microsoft Entra (Azure AD) portal, which requires administrative privileges. Please ask your Global Administrator to perform the following steps:

1. Sign in to the Microsoft Entra admin center using a web browser.
2. Navigate to "Devices" > "All Devices "
3. Locate the affected device in the Disabled devices list.
4. Select the device and click "Enable".

Once the device is enabled, Microsoft 365 sign-in should work normally.

Our first response may not fully resolve the issue, but with your input and detailed answers to follow-up questions, we can work together to find the root cause and a solution. 

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Answer 2

The authentication error code 135011 indicates that the device used during the authentication process is disabled. To resolve this issue, the administrator should enable the device in Active Directory or Microsoft Entra ID. Here are the steps you can follow:

1. Open Event Viewer.
2. Navigate to Applications and Services Logs > Microsoft > Windows > AAD > Operational.
3. Look for messages indicating that the device is not authenticated.

If the device was deleted by mistake or due to security concerns, you may need to recover it using the manual recovery method depending on how the device is joined (e.g., Microsoft Entra hybrid join). You can run the command dsregcmd /status to check the device state and proceed with recovery if necessary.

If you need further assistance, consider contacting your IT support team for help with enabling the device or recovering it if it was deleted.