How to Fix “Keyset Does Not Exist” (Error Code 80090016) in Office 365

Running into the “Keyset does not exist” error in Office 365—often linked with error code 80090016 can be frustrating, especially when it blocks access to apps like Outlook or Teams.

This issue usually points to a problem with your device’s Trusted Platform Module (TPM) or corrupted user certificates.

In this guide, we’ll break down what this error means, why it happens, and walk you through the exact steps to fix it, so you can get back to work without the tech headache.

How do I fix error code 80090016?

1. Delete the contents of the Ngc Folder

1. Close Outlook.
2. Open File Explorer.
3. Copy and paste the path below into the Address Bar:
   C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\NGC
   
4. Delete all contents of the displayed folder.

2. Delete work or school account

1. Press the Windows key + I and select Accounts in the left pane.
   
2. Select the Access work or school option.
   
3. Now, click the Disconnect button in front of the affected account.

Sometimes, the Outlook error code 80090016 or even on OneDrive and MS Teams can be due to a faulty work or school account. You can fix this by deleting the said account. After deleting the account, you can create a new one on your Windows 11 PC.

3. Rename the AAD.BrokerPlugin folder

1. Sign in to your PC with another administrator account.
2. Launch Run by pressing the Windows + R simultaneously.
3. Type the command below and press the Shift + Enter keys:
   C:\Users\%username%\AppData\Local\Packages
   
4. Scroll to find Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy folder.
   
5. Copy the folder by pressing Ctrl + C keys and paste it to Home Screen by pressing Ctrl + V keys. This is for backup.
6. Go back to the Packages folder and rename the Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy folder to Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy.old.
7. Go back to the affected user account and relaunch Outlook.
8. Select Yes to Allow my organization to manage this device if you get the Organization Prompt.
9. In case the Error Code 80090016 Office 365 reappears, ignore it this time and continue your use of Outlook.

4. Uninstall and reinstall Outlook

1. Press the Windows key and type Outlook in the Search Box.
2. Right-click on Outlook and select Uninstall.
   
3. You can reinstall Outlook by downloading it from Microsoft Store.

Tip

To fully remove Outlook and clear any leftover files that might be causing the error, use a tool like Fortect. It goes beyond a basic uninstall by cleaning up broken registry entries and system conflicts linked to Office 365 errors. A quick scan can help prevent the same issue from coming back after reinstalling.

Why is my TPM corrupted?

Most of the time, the TPM error is displayed because of interference with the PC Health Checkup. This application alerts you about your system’s compatibility with software, such as checking if you have the required resources for Windows 11.

It is also possible to get the keyset does not exist Office 365 error when malware infects your computer.

We hope the TPM keyset does not exist code 80090016 has been resolved by now, and you can operate your Outlook like before. However, if the issue persists, check our guide on how to fix the keyset does not exist error.

We also recommend reading our guide on what to do if Trusted Platform Module has malfunctioned for more solutions.

If the solution in this guide helped you solve the error code 80090016, don’t hesitate to share the tip that worked for you in the comments below.