If you are a user of Microsoft Office 365 and have encountered the error code 80090016, you are not alone. Many users have reported seeing this error while trying to sign in to their Office 365 account. This error is typically associated with a problem in the Windows Credential Manager, which stores login information for Windows-based applications.
To fix this error, one potential solution is to reset the credentials for Office 365 in the Windows Credential Manager. To do this, go to the Control Panel, then click on User Accounts, and finally on Credential Manager. From there, you can locate the credentials for Office 365 and choose to remove them. Once removed, try signing in to your Office 365 account again and re-enter your login information when prompted. This should resolve the error and allow you to access your Office 365 applications without further issues.
It’s important to note that while this solution has worked for some users, it may not be effective for everyone. If you continue to experience the error code 80090016 after attempting this fix, it’s recommended to reach out to Microsoft support for further assistance. They may be able to provide additional troubleshooting steps or a different solution to resolve the error and get you back up and running with Office 365.