How to Fix Excel Sign-In Error C0090016: TPM Has Malfunctioned
Question details
The user is unable to sign into Microsoft 365 applications like Excel, Word, and Outlook due to a Trusted Platform Module (TPM) malfunction error.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Attempting to sign in or activate Microsoft 365 desktop applications.
- Observed behavior
- The sign-in process fails, displaying error code C0090016 and stating that the computer's Trusted Platform Module has malfunctioned.
Ensure your computer's operating system is fully updated and that you have administrator privileges, as resolving TPM issues often requires system-level changes.
Reconnect Account and Rename AAD Broker Plugin
This is the primary Microsoft-recommended troubleshooting method to clear corrupted Azure Active Directory broker plugin data that causes the TPM malfunction error.
Often, the local cached credentials for your Microsoft 365 work or school account become corrupted and out of sync with the physical TPM chip. Disconnecting the account and renaming the cache folder forces Windows to build a new, clean connection.
Open Windows Settings and go to 'Accounts', then select 'Access work or school'. Click on your connected Microsoft 365 account and select 'Disconnect'.
Open File Explorer and paste '%LOCALAPPDATA%\Packages\' into the address bar. Locate the folder named 'Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy', right-click it, and rename it to 'Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy.old'.
Return to Settings > Accounts > Access work or school. Click 'Connect' and sign back into your Microsoft 365 account.
Restart your computer, open Excel, and attempt to sign in again. The C0090016 error should be resolved.
Clear the Trusted Platform Module (TPM)
If basic account resets do not work, clearing the TPM directly from Windows Security can resolve the hardware lock preventing Office activation.
Switch to WPS Office to Avoid Activation Hassles
Frustrated by Microsoft 365 activation errors and TPM malfunctions? WPS Office provides a free, lightweight, and highly compatible alternative that doesn't rely on complex hardware-bound DRM. Enjoy seamless editing without sign-in blockers.
Frequently Asked Questions
What does 'Trusted Platform Module has malfunctioned' mean?
The Trusted Platform Module (TPM) is a hardware security chip on your motherboard. This error means Microsoft Office cannot access the cryptographic keys stored in the TPM, which are required to authenticate your Microsoft 365 subscription.
Can I use Excel without fixing the C0090016 error?
If you cannot sign in, Microsoft 365 apps like Excel will eventually enter reduced functionality mode. You can view and print documents, but you won't be able to edit or create new ones until the activation error is resolved.
Will clearing the TPM delete my personal files or spreadsheets?
No, clearing the TPM will not delete personal documents, photos, or applications. However, it resets hardware security keys, which may require you to set up your Windows Hello PIN again or log back into certain secured apps.
