Outside of Windows, Microsoft has made a ton of useful software that’s used daily by people across the world. This, of course, includes the Office suite. However, as good and well-polished as the Office suite of programs might be, they do run into random bugs and errors from time to time.

In this article, we’re talking about how to fix error code 80090016 in Office 365 and the reasons behind the problem.

What causes this error?

TPM corruption issues mainly cause the error. However, other possible causes include:

Problems with the Outlook app.
Internet connectivity issues.
Recent hardware change.

Also read: How to fix error code 5: Error_Access_Denied?

How to fix this?

Here are four fixes you can try out.

Remove your school or work account

Since Outlook is directly connected to your school or work account, having a problematic account can cause problems with Outlook too. Try removing your account to see if that helps.

Step 1: Press the Windows Key + I to open Windows Settings. Once there, click Accounts, scroll down and select Access work or school.

Step 2: Click the Remove button in front of your work or school account.

Once removed, you can try logging in with a new account to see if that resolves the error.

Clear out the Ngc folder

The Ngc folder houses temporary files for Outlook. If these files are corrupted, you can run into problems. Try clearing out the folder to see if that helps.

Step 1: Close Outlook, open Windows Explorer and head over to the file path given below.

C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\NGC

Step 2: Delete all the contents inside the folder. You might need administrator privileges to do so.

Once everything is deleted, try restarting Outlook and see if it works.

Rename the Outlook broker plugin

Renaming the AAD.BrokerPlugin folder will force Outlook to create a fresh one from scratch, resolving any problems in the process.

Step 1: Close Outlook, open Windows Explorer and head over to the file path given below.

C:\Users\[Username]\AppData\Local\Packages

Step 2: Locate the Microsoft.AAD.BrokerPlugin_cw5n1h2txyewy folder and rename it to anything else. You might want to keep a copy of this folder somewhere else for backup.

Now relaunch Outlook and let it build the folder again. Your error should’ve been resolved.

Also read: Dreamtime connection error: 6 Fixes

Repair your Outlook installation

Sometimes, you might have a broken Outlook install. Follow these steps to repair your installation.

Step 1: Press the Windows key and search for Outlook. Click on Uninstall from the right side pane.

How to fix the 'Outlook Cannot Expand folder' error?

Step 2; Find your version of Outlook in the list of programs. If you’ve installed the entire Microsoft Suite at once, search for that instead, click it and click the Change button.

Step 3: You’ll see two options, as explained below.

Quick Repair: This will work offline and resolve the most common issues with your Outlook Installation.
Online Repair: As the name suggests, this option uses the internet and performs a more thorough installation repair.