Fix Microsoft 365 Error CAAC000E Device Cap Reached
Question details
Users are encountering the CAAC000E device cap reached error, which blocks access to Microsoft apps and triggers continuous login prompts.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Attempting to sign in or sync data on Microsoft Teams, OneDrive, and SharePoint.
- Observed behavior
- Applications repeatedly request authentication and disconnect. Standard local fixes like resetting the TPM or removing listed activations fail to resolve the issue.
Before reaching out to support, verify that your system date and time are synced correctly, and log into your Microsoft account portal to ensure no duplicate obsolete devices are listed under your active devices.
Create a Service Request in the Microsoft 365 Admin Center
Since local troubleshooting steps often fail to resolve backend activation or device-limit issues, contacting Microsoft Support through the Admin Center is the most effective solution.
The CAAC000E error usually stems from a backend synchronization failure regarding your device limits. Because this is a server-side issue, Microsoft support engineers need to manually investigate and reset your backend activation records.
Navigate to the Microsoft 365 Admin Center website and sign in using an account with Global Administrator privileges.
On the left-hand navigation pane, locate and click on 'Support', then select 'Service requests' from the dropdown menu.
Click on 'New service request'. Provide a brief description of the CAAC000E device cap error and state that local fixes (like TPM resets) have already been attempted.
Submit the ticket. Microsoft support engineers will use their administrative tools to investigate your backend account activations and clear the device-cap limits to restore synchronization.
Try WPS Office While Resolving Microsoft 365 Errors
If you are locked out of your documents due to the CAAC000E device cap error, WPS Office offers a free, lightweight alternative. It provides high compatibility with Microsoft formats, a familiar user interface, and allows you to continue working seamlessly without complex backend activation issues.
- 1. Download the Installer: Visit the official WPS website and download the free WPS Office installation package to your computer.
- 2. Install WPS Office: Run the downloaded file and follow the on-screen setup instructions to quickly install the software.
- 3. Open Your Office Files: Launch WPS Office and open your existing .docx, .xlsx, or .pptx files directly to resume working without Microsoft 365.
Frequently Asked Questions
What does the CAAC000E error code mean in Microsoft 365?
This error indicates that the maximum number of devices allowed for your Microsoft 365 account has been reached. It triggers continuous authentication prompts and blocks you from syncing applications like Teams and OneDrive.
Can clearing the TPM keys fix the CAAC000E error locally?
While resetting the Trusted Platform Module (TPM) can resolve some basic sign-in issues, the CAAC000E error usually involves a backend device-limit issue that requires Microsoft Support intervention to fix properly.
Why do OneDrive and SharePoint disconnect repeatedly when this error occurs?
When the device cap is reached, the authentication token fails to renew properly. This failure causes Microsoft 365 applications to lose their connection and repeatedly ask for login details in an infinite loop.
